Cool It: The Skeptical Environmentalist's Guide to Global Warming is a book by the Danish statistician and political scientist Bjørn Lomborg. The book is a sequel to The Skeptical Environmentalist (first published in Danish in 1998), which in English translation brought the author to world attention. Lomborg argues that many of the elaborate and expensive actions being considered to stop global warming will cost hundreds of billions of dollars without the same return on investment, often are based on emotional rather than strictly scientific assumptions, and may have very little impact on the world's temperature for centuries. Lomborg concludes that a limited carbon tax is needed in the First World as well as subsidies from the First World to the Third World to help fight ongoing humanitar