Richard Tol

Tol was a coordinating lead author for the IPCC Fifth Assessment Report Working Group II: Impacts, Adaptation and Vulnerability. Tol said in March 2014 that he had withdrawn from the writing team for the Summary for Policy Makers of the report in September 2013, citing disagreement with the profile of the report which he considered too alarmist and putting too little emphasis on opportunities to adapt to climate changes. On 20 May 2014 Tol wrote, in an article for FoxNews.com, that the IPCC is alarmist because it favors initial scientific papers published on an issue, rather than the follow-up papers, which, he says, tend to "pooh-pooh the initial drama."

In 2009, Tol published an influential paper that combined data from several earlier studies, concluding that at least some amount of global warming could lead to economic gains. In 2014, he published an update, correcting missing minus signs that had turned economic costs into benefits and adding data overlooked before; the mistakes he attributed to "gremlins". According to Tol, the old and new results were not significantly different. The degree to which the corrected, more pessimistic results alter the original conclusions and their policy implications was hotly debated. In 2015 it was reported that a second round of corrections to the paper was necessary.

Lomborg awarded Tol a position on his Copenhagen Consensus panel again in 2009. According to Tol, "Lomborg successfully punches holes in climate hysteria" and "plays a useful role in the debate on climate policy".

Bjørn Lomborg chose Tol to participate in his "Copenhagen Consensus" project in 2008. In 2008, Tol collaborated with Gary Yohe, Richard G. Richels and Geoffrey Blanford to prepare the "Challenge Paper" on global warming which examined three approaches devised by Lomborg for tackling the issue. The 3 results were then compared with 27 similar investigations, 3 each relating to 9 other 'challenges' in the areas of health and environment. Of the 30 policy alternatives that resulted, Lomborg's ranking procedure rated the 2 dealing with controlling emissions of greenhouse gases 29th and 30th in terms of cost effectiveness.

In 2007, Tol predicted a reduction in annual economic growth by 0.4% in the Republic of Ireland if greenhouse gases were reduced by 3% per year.

In an interview with Der Spiegel in 2005, he argued that temperature rises between 2–4 °C would also have advantages. North of a line drawn from Paris to Munich, people would benefit, e.g., from reduced energy bills. However, south of it, people would be overall "losers" of climate change.

Tol specialises in energy economics and environmental economics, with a particular interest in climate change, such as the economics of global warming. Previously, Tol was a research professor at the Economic and Social Research Institute. Before that, Tol was the Michael Otto Professor of Sustainability and Global Change and director of the Center for Marine and Atmospheric Sciences and board member of the Center for Marine and Climate Research at the University of Hamburg. Tol was a board member of the International Max Planck Research Schools on Earth System Modeling and Maritime Affairs and the European Forum on Integrated Environmental Assessment. From 1998 to 2008 he was an adjunct professor at Carnegie Mellon University's Department of Engineering and Public Policy, and from 2010 to 2011 an adjunct professor at Trinity College, Dublin's Department of Economics.

Tol obtained an MSc in econometrics & operations research in 1992 and a PhD in economics in 1997 at the VU University Amsterdam. His doctoral thesis was titled, A decision-analytic treatise of the enhanced greenhouse effect. In 1998, he contributed with some nineteen other academics to a joint project of the United Nations Environment Programme at his home university.

Richard S. J. Tol (born 2 December 1969, Hoorn, the Netherlands) is a professor of economics at the University of Sussex. He is also professor of the economics of climate change at the Vrije Universiteit Amsterdam. He is a member of the Academia Europaea.