Climate change is real, it is caused by human activity, and it is already causing devastating problems in America and around the world.
The debate is over. The scientific community has spoken in a virtually unanimous voice. Climate change is real. It is caused by human activity.
Climate change is real, caused by human activity and already devastating our nation and planet. The United States must lead the world in combating climate change and transforming our energy system away from fossil fuels and toward energy efficiency and sustainability.
George H.W. Bush said we will lead on climate change, and we'll lead from the top. That was 30 years ago. And now Republicans can't even acknowledge that climate change is human caused or real because of the outside spending in our elections.
Clinton understands that climate change is real, is caused by human activity and is one of the great environmental crises facing our planet. She knows that we must transform our energy system away from fossil fuels and move aggressively to energy efficiency and sustainable energy.
2007, according to a Harris poll, 71 percent of Americans believed that climate change was real, that it was human caused.
We can't say that when x happens we get a mass extinction. To the extent we understand mass extinction, one has been caused by glaciation event, one has been caused by a massive climate change, and one has been caused by an asteroid. These events turn out to have no precedent.
Climate change is real, it is being driven by human activity, and it is not a problem any one country can solve on its own.
I believe that climate change is real, is driven mainly by human activity and that it is driving real-world changes such as extreme weather events, hotter temperatures, rising sea levels and ocean acidification.
We seriously have to question the motivation of those people referred to as climate change sceptics, who are denying the evidence of human-caused climate change and preventing us from moving forward by spreading disinformation and supporting unchecked carbon pollution.
To those who say climate change is not caused by human activity or that addressing it will harm the economy, let's encourage them to go to college, too, and to study physics and to study economics, but for the rest of us, let's get to work.
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.
Climate change is real, it is being driven by human activity, and it is affecting the lives of people across the United States and around the world today.
... as we are being blunt, the fact is that Tony [Abbott] and the people who put him in his job do not want to do anything about climate change. They do not believe in human caused global warming. As Tony observed on one occasion "climate change is crap" or if you consider his mentor, Senator Minchin, the world is not warming, its cooling and the climate change issue is part of a vast left wing conspiracy to deindustrialise the world.
Human-caused climate change threatens almost every aspect of human existence.
I believe the ability to measure, with precision, the degree of human activity's impact on the climate is subject to more debate on whether the climate is changing or whether human activity contributes to it.