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WASHINGTON, DC - JUNE 01:  U.S. President Donald Trump concludes his announcement to withdraw the United States from the Paris climate agreement in the Rose Garden at the White House June 1, 2017 in Washington, DC. Trump pledged on the campaign trail to withdraw from the accord, which former President Barack Obama and the leaders of 194 other countries signed in 2015. The agreement is intended to encourage the reduction of greenhouse gas emissions in an effort to limit global warming to a manageable level.  (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - JUNE 01:  U.S. President Donald Trump concludes his announcement to withdraw the United States from the Paris climate agreement in the Rose Garden at the White House June 1, 2017 in Washington, DC. Trump pledged on the campaign trail to withdraw from the accord, which former President Barack Obama and the leaders of 194 other countries signed in 2015. The agreement is intended to encourage the reduction of greenhouse gas emissions in an effort to limit global warming to a manageable level.  (Photo by Win McNamee/Getty Images)

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Who influenced Trump's climate thinking?

The Competitive Enterprise Institute and its director of energy may have just helped change the political and environmental direction of an entire nation. CNN's Drew Griffin reports.

Who influenced Trump's climate thinking?

The Competitive Enterprise Institute and its director of energy may have just helped change the political and environmental direction of an entire nation. CNN's Drew Griffin reports.