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

Climate change is the central environmental ill of our time. We have an obligation to protect our children from the dangers of this widening scourge, and we aren't yet doing enough about it.

I believe global warming and climate change are real threats to our planet.

I believe that climate change represents one of the greatest threats to our national security and our planet.

Around the world, climate change is an existential threat - but if we harness the opportunities inherent in addressing climate change, we can reap enormous economic benefits.

The impact of climate change is a tremendous risk to the security and well-being of our countries.

I think global warming is the gravest threat. With global warming, it's the product of a war between old energy - between the carbon cronies, who, by the way, could not stay in business in a true free market capitalism.

Climate change is very real.

One thing we do know about the threat of climate change is that the cost of adjustment only grows the longer it's left unaddressed.

Climate change is the environmental challenge of this generation, and it is imperative that we act before it's too late.