Thomas R. Carper

Homeland nominee questions human role in climate change

Homeland nominee questions human role in climate change

President Donald Trump's choice to head the Department of Homeland Security said Wednesday that she believes climate change exists, but said she cannot determine whether humans are the primary cause.

Speaking at her Senate confirmation hearing, Kirstjen Nielsen said she is "not prepared to determine causation" on climate change.

Nielsen's comment contradicts mainstream climate science, including a U.S. report last week that concludes the evidence of global warming is stronger than ever and that it's "extremely likely" — meaning with 95 to 100 percent certainty — that global warming is man-made.

As head of homeland security, Nielsen would oversee a...

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