Extreme weather events, such as the recent flooding from Hurricane Florence in North Carolina, will be more frequent and intense under higher levels of global warming.
Credit: Joe Raedle/Getty

In calculating the potential environmental impacts of freezing federal fuel economy standards in 2020, the Trump administration made the assumption that the world will warm by about 4°C, or 7.2°F, by 2100, when compared to preindustrial levels, first reported by the Washington Post on Friday and since confirmed by Axios.

Why it matters: Such a high amount of warming would also far exceed the amount that scientists say would result in potentially catastrophic impacts, including the partial to complete collapse of the Greenland and Antarctic Ice Sheets. It also would be double the amount of warming that world leaders set as their target in the Paris Climate Agreement, which the Trump administration intends to pull out of.

The details: The National Highway Traffic Safety Administration document states that the impacts of nearly 7°F of global warming would be severe, […]

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