Today in a segment from ABC's "This Week," Senator Marco Rubio said very definitively that he does not believe that humans are contributing to climate change. In an interview with ABC's Jonathan Karl the Senator discussed his presidential aspirations, immigration and climate change.

Earlier this week the White House released its third National Climate Assessment, which said that Miami is the city at the most risk with rising sea levels. Despite this Rubio stated his skepticism to scientists worries about our warming planet.

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"I do not believe that human activity is causing these dramatic changes to our climate the way these scientists are portraying it," Rubio said to Karl. "And I do not believe that the laws that they propose we pass will do anything about it, except it will destroy our economy."

He does however believe in taking "mitigation activity," but did not state explicitly what this is. The Florida economy, which Rubio so fears will be destroyed by laws aimed at curbing climate change, will be impacted by climate change. According to the report, "Sea level rise poses widespread and continuing threats to both natural and built environments and to the regional economy."

As the Huffington Post points out, Rubio's stance on the environment is a departure from his earlier views. In 2008, as a leader of the Florida House of Representatives, Rubio helped pass a carbon emissions capping directive for the state's Department of Environmental Protection.

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Rubio also believes he is ready to be president. In the interview below he discusses his drop in polls (he's behind Donald Trump), immigration reform and a potential opponent: Hillary Clinton. When discussing Clinton, Rubio harped on Benghazi, and gave her an "F" as Secretary of State. "If she is going to run on her record as secretary of state, she’s also going to have to answer for its massive failures," Rubio said.

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h/t Huffington Post, ABC