06 December 2009


My boy Jared Diamond:

[The statement that experts disagree about climate change] was true 30 years ago, and some experts still disagreed a decade ago. Today, virtually every climatologist agrees that average global temperatures, warming rates and atmospheric carbon dioxide levels are higher than at any time in the earth’s recent past, and that the main cause is greenhouse gas emissions by humans. Instead, the questions still being debated concern whether average global temperatures will increase by 13 degrees or “only” by 4 degrees Fahrenheit by 2050, and whether humans account for 90 percent or “only” 85 percent of the global warming trend.

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