The last paragraph of the Executive Summary reads:
Simply put, the science shows us that climate change due to emissions of greenhouse gases is a serious problem. Furthermore, due to the persistence of carbon dioxide in the atmosphere and the lag in response of the climate system, there is a very high probability that we are already heading towards a future where warming will persist for thousands of years. Failing to insure against that high probability does not seem a gamble worth taking. (emphasis added)
It deals with each of these skeptic arguments and finds all of them lacking:
- The climate has not warmed since 1998
- It's all a hoax
- Climate models are defective
- The signature of greenhouse gases causing warming is missing in the atmosphere
- The Medieval Warm Period was warmer than now
- GHG increases lag temperature increases, they don't cause them
- It's the sun
- Water vapor is way, way more important than CO2
- The sensitivity in the models is wrong
- Increased CO2 is actually good
- We've adapted before, so we can again
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