The IPCC (Intergovernmental Panel on Climate Change, a group of more than 2,500 scientists) has provided the world community with first class assessments of the soaring temperatures the world is facing, the devastating impacts of these rises and the ways in which we can try and avoid the worst effects of global warming. We now know climate change is real and the hand of humankind in this warming is becoming clearer and clearer.
The impact of climate change is relatively small. The average impact on welfare is equivalent to losing a few per cent of income. That is, the impact of a century worth of climate change is comparable to the impact of one or two years of economic growth.
I don't believe ... global warming is real. Do we have climate change? Yes. Is it a crisis? No. ... Because the science, the real science, doesn't say that we have any major crisis or threat when it comes to climate change.
Climate change is real. Climate change is being substantially increased by humans and the carbon we put into the atmosphere. And it appears to be speeding up. If science has made any mistakes, science has been underestimating it.
Millennial voters are very concerned about climate change and will vote for candidates who are planning to address it. But the systems that are in place - people talk about gerrymandering and the money that's in politics, this is a real thing, a real effect - and it's hard for climate change-denying legislators to get voted out. But I predict it will happen.
Despite the international scientific community's consensus on climate change, a small number of critics continue to deny that climate change exists or that humans are causing it. Widely known as climate change "skeptics" or "deniers," these individuals are generally not climate scientists and do not debate the science with the climate scientists.
In 2013, I dedicated myself full-time to combating the very real impacts of climate change. Working across the country, NextGen Climate Action formed new coalitions and worked hard to make climate change a part of our national conversation - and across the country, we had a big impact.
Climate change hype has grave real world consequences. It gets rich countries to adopt silly policies and to impose devastating eco-imperialism on poor countries. The world's rich millions can afford environmental extremism; its poor billions can't. Climate change pseudo-science about human causality has been exposed repeatedly. What's less appreciated is that there aren't more natural disasters in need of an explanation.
Climate Change is a national security issue. We found that climate instability will lead to instability in geopolitics and impact American military operations around the world. People are saying they want to be perfectly convinced about climate science projections. But speaking as a soldier, we never have 100 percent certainty. If you wait until you have 100 percent certainty, something bad is going to happen on the battlefield.
Hollywood is the perfect conduit for the urgent message about climate change. We raise awareness all the time. We routinely take a film that nobody knows about and get 80 percent of the public to know about it in just 30 days. That's called marketing. We need to harvest Hollywood for climate change awareness.
We should be concerned about the impact of climate change on vulnerable populations, without question. There is nothing automatic about adaptation. But it's clear that there is simply no science that supports claims that rising sea levels threaten civilization much less the apocalypse.
African Americans are not going to be fooled by any group supported by industrial polluters. They know climate change is real and that we have to do something about it. Only 3 percent believe concern about climate change is overblown.
We need an international solution to the challenge of climate change, there's no question about it. But the real key is, can you actually get that - or get that solution - without the US' involvement? Can you not lead domestically, and expect the rest of the world will take action... the US needs to lead, we need to be out there.
I come back to the science that is in it to reduce our dependence on foreign oil and climate change. It's about science, science, science and science, innovation, as we rebuild America, create jobs, invest in our people and turn this economy around.
I don't know the science behind climate change. I can't say one way or another what is the direct impact, whether it's man-made or not.
It's very hard to track down what's real and what's not real. We haven't absorbed what climate change is doing. Because whether people associate it or not, fear of immigration is completely related to climate change, because the mass migrations that are happening, the war in Syria, all of these structural human migrations are related to climate change.