Those who deny human-caused climate change offer no compelling evidence to better explain the undeniable rise in atmospheric concentrations of greenhouse gases and global temperature.
People are going to buy cheap fertilizer so they can grow enough crops to feed themselves, which will be increasingly difficult with climate change.
If we think of what's up ahead, with climate change and wars over water, it's very frightening.
The irony here is this administration is spending more money on climate change research and development than any administration in all the rest of the industrialized world combined.
What happened to Haiti is a threat that could happen anywhere in the Caribbean to these island nations, you know, because of global warming, because of climate change and all this.
Some people call it global warming; some people call it climate change. What is the difference?
What we've got is the wholesale embrace of fracking domestically, internationally and for export. And this couldn't be further from what we really need to do to address climate change.
Bill Gates is a relative newcomer to the fight against global warming, but he's already shifting the debate over climate change.
It's hardly surprising that the corporate aliens lie when it comes to the relationship between doing something about climate change and the economy.
Veganism is an answer for almost every problem facing the world in terms of hunger and climate change.
I'm saying that the moral climate within the ruling class in this country is not that different from the moral climate within the ruling class of Hitler's Germany.
The problems that the world faces - from nuclear proliferation to climate change - can't be tackled by the West alone. They need a coalition of not just West and East, but they need a coalition of Christian and Jew and Muslim.
Climate change is destroying our path to sustainability. Ours is a world of looming challenges and increasingly limited resources. Sustainable development offers the best chance to adjust our course.
Look, I'm a huge supporter of Obama's - he's the first president I ever donated money to. But I think in terms of climate change and the environment, he's been, at best, disappointing.
The best way to tell people about climate change is through non-fiction. There's a vast literature of outstanding writing on the subject.
In the years to come, the combination of climate change and population growth could have a devastating effect on the planet and, needless to say, on humanity.
My father's generation's crisis was fighting fascism. Ours is fighting climate change. It is much harder because you can't see it, it is not an obvious threat. But the solution is in our hands.
I chose to document the lives of people living in a remote village in Alaska called Shishmaref because there we can literally see how climate change is affecting their homes, livelihoods and ultimately their lives.
I think you could offer seven or eight different possible ends for energy policy. Climate change is one of them. Dealing with criteria pollutants is one of those related to that.
It's the poorer people in tropical zones who will get really hit by climate change - as well as some ecosystems, which nobody wants to see disappear.
So when you're dealing with an existential threat like death or like climate change, if you see it as 'we are all toast anyway,' then denial is a pretty good way of coping.
