Climate deniers love to repeat this dead wrong talking point. Here's how to refute it.

On Sunday morning, CNN anchor Jake Tapper asked U.S. Senator Marco Rubio whether he thought the changing climate on Earth today was "at least in part" caused by humans. 

On live television, Rubio acknowledged that humans were partly responsible, and then immediately sowed some doubt into his answer.

"I think many scientists would debate what percentage is attributable to man versus normal fluctuations," Rubio said. 

This is misleading, at best, because there is no plausible debate. 

In a variety of ways, scientists globally have repeatedly shown that the modern-day warming of our oceans and atmosphere is specifically attributed human activity — not volcanoes nor the sun. We've simply loaded the atmosphere with carbon-based gases that physically trap heat.   Read more...

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