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Costing Climate: It is All Relative

August 1, 2014 by Roger Pielke, Jr.

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The White House released a report recently on “The Costs of Delaying Action to Stem Climate Change” (here in PDF). The report concludes (based on a summary by William Nordhaus in his book, The Climate Casino):

Based on a leading aggregate damage estimate in the climate economics literature, a delay that results in warming of 3° Celsius above preindustrial levels, instead of 2°, could increase economic damages by approximately 0.9 percent of global output.

The report seeks to place 0.9% of output into context by presenting it in terms of the US economy in 2014:

To put this percentage in perspective, 0.9 percent of estimated 2014 U.S. Gross Domestic Product (GDP) is approximately $150 billion.

The New York Times, mistakenly, assumes from this that the future impacts of climate change will be $150 billion:

Failing to adequately reduce the carbon pollution that contributes to climate change could cost the United States economy $150 billion a year, according to an analysis by the White House Council of Economic Advisers released on Tuesday.

To be fair, the $150 billion as cost of climate change was repeated by many media outlets. Does anyone read the report?
 
The actual impacts would be much larger, since the US (and global) economy will be larger in the future. But the White House, nor the media, mention this. Here is why.
 
Let’s assume that the US economy grows at 2% per year to 2100 (both 2% and 2100 are round numbers, feel free to pick others if you like them better). That means that the US GDP will be $82.4 billion in 2100. From that perspective, the cost of climate change will be an astounding $741 billion!
 
But that is not right either, as the cost reported by the White House was the marginal cost of going from a global temperature increase of 2 degrees Celsius to 3 degrees. According to Nordhaus (Figure 22 in the Climate Casino), the total damage cost of a 3 degree C increase is more like 3.2% of GDP. That equates to a cost of climate change of $2,635 billion! Now we are talking.
 
So why isn’t that huge number presented?
 
Well, informing people that US GDP in 2100 will increase from $15 trillion today to only $79.7 trillion in 2100, rather than $82.4 trillion, due to the effects of a 3 degree C climate change doesn’t sound so scary. This is why William Nordhaus wrote of these estimates in The Climate Casino:

The first surprise is that, for the range of changes that have been calculated, the estimated impacts of climate change are relatively small.

Postscript: For any trouble makers looking to misrepresent my views, I presented a more in depth analysis along these lines before the House Science Committee in 2007 (here in PDF). In that testimony I concluded:

Mitigation provides benefits under all scenarios discussed here, and almost all scenarios presented by the IPCC. According to the IPCC these benefits increase as the time horizon extends further into the future… nothing in this testimony should be interpreted as being opposed to or contrary to the mitigation of greenhouse gases. To the contrary, under all scenarios discussed here the benefits of mitigation exceed its costs. Mitigation is good policy, and many decision makers are now coming to understand that it is good politics, as well. 

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Roger Pielke, Jr.

Roger Pielke Jr. is a professor of environmental studies at the Center for Science and Technology Policy Research at the University of Colorado at Boulder. He also holds appointments as a Research Fellow, Risk Frontiers, Macquarie University; Visiting Senior Fellow, Mackinder Programme, London School of Economics; and Senior Visiting Fellow at the Consortium for Science, Policy and Outcomes of Arizona State University. Roger is also a Senior Fellow of The Breakthrough Institute, a progressive think tank. He is also author, co-author or co-editor of seven books, including The Honest Broker: Making Sense of Science in Policy and Politics published by Cambridge University Press (2007). His most recent book is The Climate Fix: What Scientists and Politicians Won't Tell you About Global Warming (2010, Basic Books). He is currently working on a book on technology, innovation and economic growth.

Filed Under: Climate, Communications and Messaging, Efficiency, Energy and Economy, Environment, Environmental Policy, Finance, News, Public Health, Risk Management, Sustainability Tagged With: accuracy, climate change impacts, economic analysis, media coverage

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