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Never denied climate change. It has always changed and always will.

When you talk to a Republican, many of them just outright say, 'Yeah. Climate change isn't real,' without assessing the facts, and it's a big problem. It's not a red or blue issue, it's a green issue... Not because of facts or science but because of emotion.

The climate is changing, and anyone who disagrees is, in my view, still in denial.

It's absolutely not acceptable for people to argue that, if we are going to do anything about climate change at all, well, the responsibility lies solely with the individual.

I'm not as convinced as a lot of people are that man-made climate change is the threat they think it is.

The problem with climate change is that it's quite complicated for the ordinary person to understand.

Many climate change deniers would have you believe that addressing climate change is all pain and no gain. This is simply not true. We can tackle this challenge while improving our personal health and the health of our economy. These are not competing interests; they go hand in hand.

We have to face the reality of climate change. It is arguably the biggest threat we are facing today.

We need to start by having a conversation about climate change. It would be irresponsible to avoid the issue just because it's uncomfortable to talk about.