The Reporter

The Economic Impact of Climate Change over Time and Space

Climate change is an unintended consequence of the industrialization of the world economy. The evidence that human activity has released large amounts of CO 2 into the atmosphere, leading to rising global temperatures, is by now uncontroversial. However, so far, the scientific and political recognition of this reality has not translated into a commitment to emissions reductions sufficient to stop further global warming. As a result, economists are tasked with evaluating the economic costs of climate change and designing policies to address them. These evaluations are essential: the world cannot embark on ambitious attempts to reduce carbon emissions if we are not reasonably confident that the benefits of these actions will outweigh their costs.

Evaluating the economic impact of climate change is difficult. First, there is the natural science. Models that map carbon emissions to changes in global and local temperatures are readily available, but the mapping of many other physical impacts, such as sea level rise, extreme weather events, or nonlinearities in the climate system, is more complex. While our understanding of these effects is rapidly improving, as shown by the recent Intergovernmental Panel on Climate Change report, there are still no good off-the-shelf models that we can easily plug into our economic analysis.

Second, climate change evolves relatively slowly, unfolding over decades and centuries rather than over months and years. While anthropogenic temperature change is already affecting our present-day reality, many of its more pernicious effects will only be felt in the distant future. Evaluating the implications of warmer temperatures in the far-off future requires dynamic models, as recognized since the pioneering work of William Nordhaus. These protracted effects limit the usefulness of reduced-form empirical studies: extrapolating so far out of sample is undesirable and does not recognize the capacity of humans to react, respond, and adapt to changing circumstances. The Lucas critique — that historical data on the results of economic policy cannot be used to accurately predict the consequences of future policy because people’s behavioral responses also change over time — bites hard here.

Third, CO 2 emissions are a global externality with local economic impact. Because CO 2 mixes rapidly in the atmosphere, emissions from anywhere on the planet lead to changing temperatures across the globe. As a result, any attempt to evaluate the economic impact of climate change needs to be global in nature. At the same time, an aggregate dynamic model of the world economy is not sufficient if it ignores spatial heterogeneity. How can we discuss the impact of coastal flooding without recognizing the difference between Miami and Dallas, or without considering that people can move inland to escape inundation? And how can we evaluate the cost of a 1 ° C increase in global temperatures without recognizing that this will result in a more than 2 ° C increase in the most northern latitudes but only a 0.5 ° C increase in some equatorial regions? Perhaps more importantly, how can we do a comprehensive evaluation if we ignore the fact that higher temperatures are bound to have very different economic effects in the world’s coldest and warmest areas? Recognizing this spatial heterogeneity is essential for an accurate assessment of not just the aggregate impact of climate change, but also the spatial inequality that it might generate.

The Need for Spatial-Dynamic Models

Motivated by these observations, we came to realize the need for economic climate assessment models that take both temporal and spatial dimensions explicitly into account. As temperatures and sea levels change, individuals and firms will respond, and an important part of that adaptation will materialize between, rather than within, locations. Incorporating these behavioral responses requires models with a realistic geography of the world economy that include trade and migration linkages across space. Furthermore, such models also need to recognize that the geography of the world’s productive capacity is not immutable. Where economic activity is concentrated varies significantly over time. The rise of China as a manufacturing powerhouse is but one example of these geographic shifts. As climate changes, areas that benefit from rising temperatures will attract investment and grow. To account for this, climate assessment models should allow growth to endogenously differ across regions.

Over the last decade we have undertaken a research agenda to develop quantitative dynamic spatial models with the goal of evaluating the economic impact of climate change. In doing so, we continue a long tradition of using assessment models that integrate the basic insights of climate science into economic modeling. The difference is that we bring the spatial-dynamic aspect to the forefront. There are various precedents, but we first introduced a model with some of these characteristics in 2014. 1 It features growth and investment in a one-dimensional framework with a continuum of locations, two sectors, costly trade, and free migration.

Temperature Change across Latitudes

In 2015, we used this framework to study the effect of global warming on sectoral specialization, trade, and mobility. 2 As a first pass, a one-dimensional framework that focuses on differences across latitudes and ignores differences across longitudes is reasonable: a mere 5 percent of the world’s variance in temperature occurs within latitudes.

This research helped us realize the importance of the changing spatial distribution of economic activity in determining the economic cost of global warming. The logic is simple but, we believe, compelling. If moving across locations is cheap, particularly over decades or centuries, and if global warming hurts some places but not others, then changing the spatial distribution of economic activity can be a powerful way to mitigate the losses from climate change. This adaptation mechanism is particularly strong if land is abundant in regions that might benefit from rising temperatures, such as Alaska, northern Canada, and Siberia.

The inevitable conclusion is that the losses from climate change must, to a large extent, be linked to the cost of moving economic activity across locations. These costs are related to moving people and firms. They also depend on trade barriers and on frictions associated with changing local specialization patterns. Additional costs involve leaving behind capital and past investments in local productivity. Losing the agglomeration economies linked to existing clusters of economic activity compounds these costs, even though new population centers sprout up elsewhere.

Modeling the World’s Geography

To more precisely quantify these costs and the spatial frictions faced by agents adapting to climate change, we needed a model with realistic geography. Although a one-dimensional model may be enough to analyze the main effects of rising temperatures across latitudes, it does not suffice to convincingly assess the economic effects of climate change for specific regions in the world and it does not allow use of quantitatively realistic spatial frictions.

In 2018, we developed and quantified a dynamic spatial model with two dimensions, latitude and longitude. Importantly, it features firm investments in local technology that lead to differential local growth in the very protracted transition to a balanced growth path. We used this framework to understand the role of migration and trade frictions in shaping the evolution of the geographic distribution of activity in the world economy. 3 Our findings indicate that completely unrestricted migration would increase world welfare by 306 percent. Lending credibility to the framework, a backcasting exercise performed well in predicting population changes across regions over time. More specifically, using a quantification based on data from the year 2000 at a 1 ° by 1 ° spatial resolution for the entire globe, we ran the model backward for 50 years and found a correlation between model-implied population changes and actual population changes of 0.74. The fundamental forces in the model can account for many of the changes in the distribution of the world population over half a century without introducing any of the specific local and aggregate shocks that the world economy experienced over this period. Because of these encouraging results, this framework has served as the core economic structure for our subsequent work on climate change.

The Economic Cost of Sea Level Rise

One of the main consequences of a warming world is the global rise in sea levels, expected to surpass half a meter on average by the year 2100. To assess the economic impact of the inundation of coastal areas, we joined forces with climate scientists who generated probabilistic sea level rise projections for various locations around the globe. 4 Although all oceans are connected, the sea level does not rise uniformly across space, due to differences in factors such as ocean dynamics and tectonics. For example, because of high subsidence, Galveston, Texas is predicted to experience twice the average sea level rise, whereas, because of solid earth responses to regional glacial mass loss, Juneau, Alaska is predicted to experience a drop in its sea level. We combine data on the range of possible paths for the extent of inundation of coastal regions over the next 200 years with our economic model to analyze the economic effect of sea level rise. The result is a probabilistic assessment of the welfare cost of coastal flooding.

Naturally, the ability to move is an effective way to avoid the most harmful impact of rising oceans. Moving is expensive though, and past investments in coastal areas are lost. Still, these costs are substantially lower than when mobility is not considered. Figure 1 depicts the global welfare losses between the years 2000 and 2200 for the median sea level rise projection. Under our baseline estimate (in black), average welfare losses peak around 2150 at roughly 0.5 percent. The figure represents three more scenarios: the static equilibrium (in dark grey) does not allow for changes in firm investments in response to flooding, the fixed population equilibrium (in light grey) does not allow flooding-induced population mobility, and the naïve equilibrium (in blue) keeps the spatial distribution of population as observed in 2000. As expected, when we allow for more forms of adaptation, the negative effect of sea level rise on welfare declines. Going from the naïve scenario with no adaptation at all to our baseline reduces the welfare costs fivefold, from around 2.5 percent to less than 0.5 percent. Of course, sea level rise constitutes only one of the dimensions along which climate change affects the economic environment. It also happens to be a dimension where adapting by moving is particularly useful.

Figure1 Desmet Rossi-Hansberg Reporter 2021 number 4

The Geography of Global Warming

In recent work, we have turned our attention from sea level rise to global warming, using a more comprehensive and sophisticated assessment model. We allow changes in local temperatures to influence three local characteristics. 5 First, changes in temperature affect local productivity, with the impact depending on the location’s initial temperature. Second, changes in temperature have an effect on the attractiveness of a location as a place to live — what is commonly referred to as a location’s amenities. Third, temperature can influence the difference between birth and death rates. Where someone is born matters because migration is costly.

In addition, we incorporate the decision of how much energy to use in production, the choice of the intensity of fossil fuels in generating energy, and the resulting CO 2 emissions of these local choices. Together with a standard carbon cycle model, this yields a framework in which the behavior of the economy affects climate scenarios and vice versa. Incorporating this two-way feedback between local economies and climate is essential if a model is going to be useful in evaluating climate policy.

Figure2 Desmet Rossi-Hansberg Reporter 2021 number 4

The spatial heterogeneity of the impact of global warming is stark. Figure 2 depicts the cost of global warming across the world’s geography and is expressed as welfare under global warming relative to welfare in a counterfactual scenario where temperatures do not rise. Grey and light blue areas in the map lose, while dark blue areas gain. On average, the world experiences welfare losses of 5 percent, but in the world’s poorest regions losses tend to be substantially larger, as much as 15 percent. The graph in the right panel of Figure 2 presents the population-weighted distribution of these gains and losses. The distribution is bimodal, with many areas of Central Africa, Latin America, and Southeast Asia losing about 10 percent, while many advanced economies lose only marginally and some of the northernmost regions gain. The big story is the spatial heterogeneity of the effects of climate change, and the corresponding augmenting inequality, with the world’s poorest regions being hardest hit.

A core part of the quantification of these welfare losses is the estimation of the damage functions that map changes in temperature to changes in productivity and amenities. Estimating damage functions requires using model-implied fundamental productivities and amenities, rather than final outcomes that already include the many adaptation margins that we are modeling. Using model-implied fundamentals for several periods, we can incorporate local fixed effects and regional trends when estimating the damage functions.

Our damage function estimates suggest that an increase of 1 ° C in local temperatures implies a decline in amenities of about 2.5 percent in the world’s hottest areas, and a commensurate increase in the world’s coldest areas. The effects of temperature on productivity are larger and asymmetric: a 1 ° C increase in local temperatures leads to a 15 percent decline in productivity in the warmest regions and a 10 percent increase in the coldest regions. The estimates of these semi-elasticities are statistically significant in the world’s warmest and coldest areas, but the damage functions are estimated with sizable error. This implies uncertainty in the evaluation of global warming. Future research should focus on reducing this error by getting a longer panel of data and by conditioning on not just the mean local temperature, but also on the variance and on the frequency of extreme temperatures.

Trade and Migration as Adaptation Mechanisms

In addition to migration, trade also has the potential to act as a powerful adaptation mechanism. There are, of course, situations where the scope for trade to mitigate the impact of climate change is limited. For example, if global warming affects the productivity of all local firms similarly and if changes in temperature are spatially correlated, trade may not be an effective adaptation mechanism. However, the effect of temperature on productivity likely varies by sector, so trade can help hard-hit locations switch to sectors that are less affected by climate change.

In recent research, we incorporate an agricultural and a nonagricultural sector and evaluate how changes in local specialization may operate as an adaptation mechanism. 6 Our analysis shows that the role of trade is complex. On the one hand, freer trade increases the scope of local specialization, leading to smaller losses from global warming. On the other hand, freer trade weakens the incentives for people to migrate away from today’s poorest regions, which are more affected by climate change. On balance, we find that freer trade increases losses from global warming in the near future but reduces losses in the far-off future.

Figure3 Desmet Rossi-Hansberg Reporter 2021 number 4

As adaptation mechanisms, trade and migration are substitutes. Figure 3 depicts the climate-induced change in population in 2200 when trade costs are high compared to when trade costs are low. Areas marked in dark blue gain more population due to rising temperatures when trade costs are high, and areas marked in light blue and grey lose more population. The map shows that more people move away from highly affected areas in equatorial regions when trade costs are higher. That is, when trade has less scope to act as an adaptation mechanism, migration plays a bigger role.

What’s Next?

We are continuing to improve our climate assessment model, estimating richer damage functions that incorporate episodic effects and their variance, incorporating anticipatory effects on investments, and adding a richer sectoral composition with input-output linkages. Our agenda includes a thorough evaluation of various environmental policies, including their spatial characteristics and implications.

Researchers

More from nber.

“ Spatial Development ,” Desmet K, Rossi-Hansberg E. NBER Working Paper 15349, revised December 2011, and American Economic Review 104(4), April 2014, pp. 1211–1243.  

“ On the Spatial Economic Impact of Global Warming ,” Desmet K, Rossi-Hansberg E. NBER Working Paper 18546, November 2012, and Journal of Urban Economics 88, July 2015, pp. 16–37.

“ The Geography of Development: Evaluating Migration Restrictions and Coastal Flooding ,” Desmet K, Nagy D, Rossi-Hansberg E. NBER Working Paper 21087, April 2015, and Journal of Political Economy , 126(3), June 2018, pp. 903–983.  

“ Evaluating the Economic Cost of Coastal Flooding ,” Desmet K, Kopp R, Kulp S, Nagy D, Oppenheimer M, Rossi-Hansberg E, Strauss B. NBER Working Paper 24918, August 2018, and American Economic Journal: Macroeconomics 13(2), April 2021, pp. 444–486.  

“ The Economic Geography of Global Warming ,” Cruz J, Rossi-Hansberg E. NBER Working Paper 28466, February 2021.  

“ Local Sectoral Specialization in a Warming World ,” Conte B, Desmet K, Nagy D, Rossi-Hansberg E. NBER Working Paper 28163, December 2020, and Journal of Economic Geography 21(4), July 2021, pp. 493–530.  

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The trillion dollar climate finance challenge (and opportunity)

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It’s overwhelmingly accepted that climate change is a very significant threat to humanity and while there are countless solutions to tackling what has been described by the UN as the “existential threat” of our times, it is still not fully clear how these solutions will be paid for. 

Investments in renewable energy and sustainable infrastructure are growing, however from January 2020 to March 2021, globally, more money was spent on fossil fuels, which when burned, create the harmful gasses driving climate change.

Women build barriers in Nepal to prevent the river from overflowing and flooding nearby villages.

Many countries lack the financial resources to make the transition to clean energy and a sustainable way of life that could reverse climate change. The UN says that climate finance is the answer because not investing will cost even more in the long-term, but also because there are significant opportunities for investors.

What is Climate finance?

Broadly speaking, climate finance relates to the money which needs to be spent on a whole range of activities which will contribute to slowing down climate change and which will help the world to reach the target of limiting global warming to an increase of 1.5°C above pre-industrial levels.

To reach this goal, the world needs to reduce its greenhouse gas emissions to practically zero by 2050; the phrase net-zero is also heard a lot in the context of financing climate action ( you can read more about it here ).

Women in rural Costa Rica are planting trees to help fight climate change.

Initiatives that must be financed to reach net-zero, include those which reduce emissions of harmful gasses as well as enhancing or protecting the natural solutions which capture those gasses, like forests and the ocean.

The finance also aims to build the resilience of populations most affected by climate change and help them to adapt to changing climatic conditions, measures which in turn will help to reduce warming.

The finance exists and so do the solutions, to transition to what the UN calls a green economy. Renewable energy which provides electricity without producing carbon dioxide or other forms of air pollution is a crucial building block for powering sustainable economic growth. 

Why is it important?

With global temperatures rising, along with changing weather patterns, sea-level rise, increases in droughts and floods, the world’s most vulnerable populations are facing ever-increasing risks, food insecurity and have fewer chances to break out of poverty and build better lives.

Floods in Bangladesh have destroyed homes in remote villages in Islampur.

In fact, the UN estimates that climate change could drive an additional 100 million people into poverty by 2030.

Significant financial resources, sound investments and a systematic global approach are needed to address these worrying trends.

So how much is needed?

Significant investments are needed and international cooperation is critical. More than a decade ago, developed countries committed to jointly mobilize $100 billion per year by 2020 in support of climate action in developing countries.

It may sound like a lot but compare that to world military expenditure in 2020 which was estimated at just under $2 trillion or $2,000 billion, or the trillions of dollars spent by developed countries on COVID-related relief for their citizens.

Solar panels are being used in Cambodia to help meet the country's demand for energy .

According to an expert report prepared at the request of the UN Secretary-General, the $100bn target is not being met (the latest available data for 2018 is $79bn), even though climate finance is on an “upward trajectory.”

So, there is still a big gap in finance.

Does it make financial sense?

The real question is whether the world can afford not to invest in climate action.

Communities in all parts of the world are already suffering from the financial effects of climate change, be it crop loss due to drought, or major damage to infrastructure caused by flooding or other extreme weather.

The UN Special Envoy on Climate Action and Finance, Mark Carney, says the huge amount of investment required represents an opportunity and not a risk , arguing that the benefits that flow from these investments dramatically outweigh any upfront costs. 

Air pollution from coal-fired power plants is linked to  global warming and other damaging environmental and public health consequences.

It is also increasingly accepted that climate investments make economic sense. The financial and business cases for clean energy are stronger than ever. In most countries, going solar is now cheaper than building new coal power plants. Clean energy investments also drive economic growth, with a potential to create 18 million jobs by 2030; and that’s including the inevitable fossil fuel job losses. 

Where is the money coming from? 

This is where it becomes complicated but, generally speaking, finance is coming from a wide range of public and private funding sources, which are supporting innovative climate action initiatives at a local, national or transnational level. 

A variety of financial instruments can be used to provide climate finance from green bonds to direct project-based loans to direct investments in energy or technology providers. 

Wind farms have been built in offshore locations around the United Kingdom.

The UN says it seeks to combine the “determination of the public sector with the entrepreneurship capacities of the private sector,” supporting governments in making climate investments easier and more attractive for private sector companies. 

Fortunately, the UN reports that “efforts to engage the private sector in meeting the Paris goals are gaining momentum”. 

A lot of climate funding is channeled through numerous UN funds and programmes.

What next? 

The annual $100bn commitment, “is a floor and not a ceiling” for climate finance, according to the UN. 

The UN Environment Programme ( UNEP ) estimates that adaptation costs alone faced by just developing countries will be in a range of $140 billion to $300 billion per year by 2030, and $280 billion to $500 billion annually by 2050.  

The coastal zones of the Pacific are among the most vulnerable in the world.

It’s worth remembering here that adaptation is only one part of the complicated climate action puzzle. Once mitigation and decarbonization efforts and global resiliency efforts, in both the developing and developed world are factored in the annual cost will greatly exceed $500 billion and possibly even more than a trillion dollars.  

But the benefits of the investments will be far greater-- shifting to a green economy could yield a direct economic gain of $26 trillion through 2030 compared with business-as-usual.  

UN-backed international climate funds

  • Countries recognized the need for specific climate financing in the Paris Agreement the legally binding treaty adopted by the international community in December 2015.
  • It calls for “making finance flows consistent with a pathway towards low greenhouse gas emissions and climate-resilient development. ”
  • Climate Investment Funds  (CIFs): The $8 billion fund “accelerates climate action by empowering transformations in clean technology, energy access, climate resilience, and sustainable forests in developing and middle-income countries.” 
  • Green Climate Fund  (GCF): Set up by the UNFCCC in 2010, GCF is the world’s largest dedicated climate fund, mandated to support mitigation and adaptation action equally in developing countries.
  • Adaptation Fund (AF): The fund has committed some $830m since 2010 to help vulnerable communities in developing countries adapt to climate change
  • Global Environment Facility  GEF aims to “catalyze transformational change in key systems that are driving major environmental loss”, in particular energy, cities and food.
  • UN-REDD : Three UN agencies (UNEP, UNDP and FAO) teamed up a decade ago to protect forests, a “pre-eminent nature-based solution to the climate emergency”.
  • Clean Technology Fund (CTF):  The $5.4bn is “empowering transformation in developing countries by providing resources to scale up low carbon technologies”.
  • climate action
  • climate finance

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  • 20 October 2021

The broken $100-billion promise of climate finance — and how to fix it

  • Jocelyn Timperley 0

Jocelyn Timperley is a freelance climate journalist in San José, Costa Rica.

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A damaged temporary home near the Meghna River in Bangladesh, in a coastal area threatened by erosion and rising saltwater levels in soil. Credit: Zakir Hossain Chowdhury/Barcroft Media/Getty

Twelve years ago, at a United Nations climate summit in Copenhagen, rich nations made a significant pledge. They promised to channel US$100 billion a year to less wealthy nations by 2020, to help them adapt to climate change and mitigate further rises in temperature.

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Nature 598 , 400-402 (2021)

doi: https://doi.org/10.1038/d41586-021-02846-3

Independent Expert Group on Climate Finance. Delivering on the $100 Billion Climate Finance Commitment and Transforming Climate Finance (Independent Expert Group on Climate Finance, 2020).

Google Scholar  

Organisation for Economic Co-operation and Development. Climate Finance Provided and Mobilised by Developed Countries: Aggregate Trends Updated with 2019 Data (OECD, 2021).

Multilateral Development Banks. 2020 Joint Report on Multilateral Development Banks’ Climate Finance (Multilateral Development Banks, 2020).

Carty, T., Kowalzig J. & Zagema, B. Climate Finance Shadow Report 2020 (Oxfam, 2020).

Bos, J. & Thwaites, J. A Breakdown of Developed Countries’ Public Climate Finance Contributions Towards the $100 Billion Goal (World Resources Institute, 2021).

United Nations Environment Programme. Adaptation Gap Report 2020 (UNEP, 2020).

Naran, B. et al. Global Landscape of Climate Finance 2021 (Climate Policy Initiative, 2021).

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