Most policies that target climate change – such as carbon taxes and cap-and-trade programmes – have long-term benefits but short-term economic costs. This column argues that population policies may not be subject to this trade-off. In particular, policies that reduce population growth can have a direct positive effect on income per capita as well as lowering growth of carbon emissions. Such policies could play an important role in the portfolio of actions aimed at mitigating climate change.
Gregory Casey, Oded Galor, 23 March 2017
Ric Colacito, Bridget Hoffmann, Toan Phan, 28 October 2016
Policy proposals to offset the effects of global warming would be strengthened if we knew more about the net economic benefits of climate action relative to business-as-usual. This column argues that estimates may understate the future costs of business as usual because of heterogeneous seasonal effects, and because more business sectors than previously assumed suffer a negative impact from increased summer temperatures. The cost of inaction may be equal to one-third of the growth rate of US GDP over the next 100 years.
, 14 October 2016
What could the solutions for the global energy challenge be? In this video, Michael Greenstone discusses three aspects of this challenge. The video was recorded at the International Growth Centre.
Larry Levin, Matthew S. Lewis, Frank Wolak, 13 October 2016
A consensus that the demand for gasoline is price inelastic means that policymakers have opted to disregard price instruments when addressing gasoline consumption and climate change. This column analyses daily citywide data on gasoline prices and consumption to show that demand for gasoline is in fact substantially more elastic than previously thought. This is a major argument in favour of the effectiveness of price-based mechanisms in reducing greenhouse gas emissions.
Bridget Hoffmann, 07 October 2016
What is the impact of climate change on the US economy? In this video, Bridget Hoffman compares summer temperatures to make predictions about future GDP growth. This video was recorded during the European Economic Association's Congress held in Geneva at the end of August 2016.
Achyuta Adhvaryu, Namrata Kala, Anant Nyshadham, 27 August 2016
Energy-efficient technologies are an increasingly relevant policy priority, given growing consensus on the need to tackle climate change. This column examines the productivity benefits of adopting one such technology – LED lighting – for manufacturing firms in India. It finds that improved productivity resulting from LED lighting’s lower heat emissions makes adopting such technology far less costly than previous anticipated, particularly for labour-intensive firms in hot climates.
Garth Heutel, Juan Moreno-Cruz, Katherine Ricke, 04 June 2016
At the the Paris Climate Conference in December 2015, it was agreed that annual global temperature increase must be kept below 2 degrees, and a target of a 1.5 degree annual increase was set. Most environmental policies currently focus on emissions reductions and adaptation. This column discusses a new set of technologies collectively known as climate engineering, and explores their potential effectiveness and role in climate change economics. A lot of uncertainty surrounds the costs and effects of climate engineering tools, but it is clear that they would change the optimal levels of emissions reduction currently discussed in literature.
Stefano Giglio, Matteo Maggiori, Johannes Stroebel, Andreas Weber, 23 January 2016
While some of the costs of climate change won’t be incurred for centuries, the actions to mitigate them need to be taken today. Over such a long timespan, small changes in discount rates can drastically change the attractiveness of such investments. This column presents estimates of appropriate discount rates for very long time horizons. The long-run discount rate for one important risky asset class – real estate – is estimated at 2.6%. This provides an upper bound on long-run discount rates for climate change abatement, one that is substantially lower than some of the rates currently being employed.
Adriana Kocornik-Mina, Thomas McDermott, Guy Michaels, Ferdinand Rauch, 21 January 2016
During the past couple of months alone, floods have displaced 100,000 people or more in Kenya, in Paraguay and Uruguay, and in India, as well as more than 50,000 people in the UK. And rising sea levels due to climate change loom. This column assesses the risk and the challenges for policymakers. It details the effects of flooding in cities around the world, showing that economic activity is concentrated in low-elevation urban areas, despite their much greater exposure to flooding. And worryingly, economic activity tends to return to flood-prone low-lying areas rather than relocating.
Stefano Giglio, Matteo Maggiori, Johannes Stroebel, Andreas Weber, 29 November 2015
The optimal investment to mitigate climate change crucially depends on the discount rate used to evaluate the investment’s uncertain future benefits. The appropriate discount rate is a function of the horizon over which these benefits accrue and the riskiness of the investment. In this paper, we estimate the term structure of discount rates for an important risky asset class, real estate, up to the very long horizons relevant for investments in climate change abatement. We show that this term structure is steeply downward-sloping, reaching 2.6% at horizons beyond 100 years. We explore the implications of these new data within both a general asset pricing framework that decomposes risks and returns by horizon and a structural model calibrated to match a variety of asset classes. Our analysis demonstrates that applying average rates of return that are observed for traded assets to investments in climate change abatement is misleading.
Richard Tol, 17 December 2015
The 21st Conference of the Parties (COP21) to the United Nations Framework Convention on Climate Change has successfully negotiated a Paris Agreement. International climate policy will be shaped by the events in Paris for years to come. This column highlights three key developments.
Ejaz Ghani, Arti Grover Goswami, William Kerr, 18 November 2015
Urbanisation in India is taking many twists and turns. Organised manufacturing is moving out of urban areas, while unorganised manufacturing is transitioning towards urban areas. As the fourth greatest energy consumer in the world, how the country manages this ongoing industrialisation and urbanisation process will have important environmental implications. This column looks at the relationship between growth, geography, and energy efficiency in manufacturing in India. Electricity consumption per unit of output has declined in urban and rural areas, but these overall trends mask substantial variation between states and substantial potential for further efficiency improvements in energy-intensive industries.
Cristina Cattaneo, Giovanni Peri, 14 November 2015
Climate change can affect agricultural productivity and the incentives of people to remain in rural areas. This column looks at the effects of warming trends on rural-urban and international migration. In middle-income economies, higher temperatures increased emigration rates to urban areas and to other countries. In very poor countries, however, higher temperatures reduced the probability of emigration to cities or to other countries, consistent with the presence of liquidity constraints.
Scott Barrett , Carlo Carraro, Jaime de Melo, 10 November 2015
This year, for the first time ever, nearly all of the world’s countries are making pledges to help limit future climate change. As of 1 October, 147 countries (representing about 85% of global emissions) have submitted their Intended Nationally Determined Contributions. These pledges, if carried out in full, are expected to lower emissions relative to the ‘business as usual’ forecast. However, they are not expected to prevent emissions from increasing above today’s level through 2030. To meet the global goal of limiting mean global temperature change to 2°C relative to the pre-industrial level, much more will need to be done after 2030. Eventually, emissions will have to fall to zero worldwide – either that, or countries will need to remove carbon dioxide directly from the atmosphere. This column introduces a new Vox eBook that looks into what needs to be done to build a climate regime that is both workable and effective.
Lucas Bretschger, 11 October 2015
There is reasonable hope that the upcoming United Nations Conference on Climate Change in Paris (COP21) will reach a consistent global climate agreement. What makes the negotiations particularly difficult is not economic efficiency, but the equity implications of climate policy. This column presents a framework for incorporating equity concerns into policy design. Building from four equity principles, it reduces the complex problem of international burden sharing to a simple rule tied to a single metric.
Richard Tol, 17 September 2015
The international climate negotiations have moved away from targets such as keeping warming below 2°C in favour of more realistic goals. This column presents new evidence on the economic impacts of climate change. The initial impacts of climate change on welfare might be positive, but in the long run the negative effects dominate, and will be substantially higher in poor countries. Poverty reduction therefore complements greenhouse gas emissions reduction as a means to reduce the impacts of climate change.
Arvind Subramanian, 16 July 2015
In December, the 21st United Nations Climate Change Conference will be held in Paris. This column discusses how India – despite its image as a recalcitrant negotiator – has exhibited considerable initiative towards improving its environmental footprint in recent years. Along with a host of actions targeting emissions, deforestation, and alternative energy source, India has surpassed many developed nations in responding to recent declines in international energy prices. These efforts mean India will be able to make a substantial contribution towards the success of the negotiations in Paris
Richard Layard, Gus O'Donnell, Nicholas Stern, Adair Turner, 08 June 2015
If clean energy were cheaper than dirty energy, climate change would halt. Making clean energy cheaper is a problem – like putting a man on the moon – that can be cracked if the effort is properly organised and financed. This column proposes a ten-year ‘Global Apollo Programme’ to achieve the necessary price reversal.
Catherine Hausman, Ryan Kellogg, 15 May 2015
The economic and environmental impacts of the US fracking boom are hotly debated. This column argues that there’s been a large positive impact on the US economy, estimating that the benefits to producers and consumers totalled $48 billion in 2013, or around one-third of 1% of US GDP. The climate change impacts have been large, but they do not outweigh the private gains. However, a lack of data on the impacts to water, air, and seismic activity hamper policymakers effectively targeting the areas of greatest concern and hamper them drawing up effective regulation.
Jason Furman, Ron Shadbegian, Jim Stock, 25 February 2015
The cost of delaying climate action has been studied extensively. This column discusses new findings based on a meta-analysis of published model runs. A one-decade delay in addressing climate change would lead to about a 40% increase in the net present value cost of addressing climate change. If anything, the methodology used in this analysis could understate the cost of delay. Uncertainty and the possibility of tipping points provide a motivation for more action as a form of insurance against worse outcomes.