Global warming isn't a prediction. It is happening.

Global warming is not a conqueror to kneel before - but a challenge to rise to. A challenge we must rise to.

The most important thing about global warming is this. Whether humans are responsible for the bulk of climate change is going to be left to the scientists, but it's all of our responsibility to leave this planet in better shape for the future generations than we found it.

Only by planting trees, we will be able to overcome global warming.

Eighty per cent of global warming comes from livestock and deforestation.

It is unfortunately true that our generation and that of your parents have left you with a big mess that will now be yours to clean up: wars, budget challenges, pollution, global warming, battles of health care, natural disasters. They're all there for you. We're willing those to you. Are you ready?

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

Pollution from human activities is changing the Earth's climate. We see the damage that a disrupted climate can do: on our coasts, our farms, forests, mountains, and cities. Those impacts will grow more severe unless we start reducing global warming pollution now.

When it comes to global warming, coal is the gorilla in the room.

It is the greatest scam in history. I am amazed, appalled and highly offended by it. Global Warming; It is a scam. Some dastardly scientists with environmental and political motives manipulated long term scientific data to create an illusion of rapid global warming.

The pace of global warming is accelerating and the scale of the impact is devastating. The time for action is limited - we are approaching a tipping point beyond which the opportunity to reverse the damage of CO2 emissions will disappear.

If each one of us does our bit, we will be helping to keep global warming from harming our countries.

The fight against global warming is a humanitarian issue - how the planet can be preserved - and it is also an issue of considerable economic importance, of what we call green growth.

Global warming is controversial, of course, but the controversy is mainly over whether human activity is driving it.

I think we should all be more concerned about the environment and the effects of global warming. It will be pointless to talk about all the issues that divide us when it's 300 degrees outside.

I would like nuclear fusion to become a practical power source. It would provide an inexhaustible supply of energy, without pollution or global warming.

Global warming, like Marxism, is a political theory of actions, demanding compliance with its rules.

Collective human actions are transforming, even ravaging, the biosphere - perhaps irreversibly - through global warming and loss of biodiversity.

Would you bet your paycheck on a weather forecast for tomorrow? If not, then why should this country bet billions on global warming predictions that have even less foundation?

Scientists have been warning about global warming for decades. It's too late to stop it now, but we can lessen its severity and impacts.

We all need to find the simplest and easiest ways to help stop global warming.

I'm not a scientist. That's why I don't want to have to deal with global warming, to tell you the truth.

The newspaper headlines may shout about global warming, extinctions of living species, the devastation of rain forests, and other worldwide catastrophes, but Americans evince a striking complacency when it comes to their everyday environment and the growing calamity that it represents.

We need to treat the planet as a system, and up until now, we've operated more as if the world were made of separate parts - this part is environment, this part is economy. But everything is connected. You can't fix global warming with a Ph.D. in thermodynamics!

Marxism, Freudianism, global warming. These are proof - of which history offers so many examples - that people can be suckers on a grand scale. To their fanatical followers they are a substitute for religion. Global warming, in particular, is a creed, a faith, a dogma that has little to do with science.

We need to remind ourselves that our ultimate goal is not to reduce greenhouse gases or global warming per se but to improve the quality of life and the environment. We all want to leave the planet in decent shape for our kids. Radically reducing greenhouse gas emissions is not necessarily the best way to achieve that.

Global warming is real - it is man-made and it is an important problem. But it is not the end of the world.

Much of the debate over global warming is predicated on fear, rather than science.

The global warming hysterics don't just offer opinions and beliefs about greenhouse gases and the like. These are people who speak as if they belong to a cult.

We are not insisting on planting trees just because of global warming. Hinduism, Christianity, and Islam insist on the necessity of trees. Especially in Hinduism, the peepal tree is worshiped as Lord Ganesha while neem is worshiped as a goddess.

The topic of global warming is so heavy that sometimes the only way you can open people's eyes is by greeting them with levity and self-deprecation first.

Global Warming: It is a hoax. It is bad science. It is high-jacking public policy. It is the greatest scam in history.

This accumulated debt at all levels of our society poses an immediate existential threat to America. Now unlike the manufactured crises of global warming and healthcare, this is a true crisis. This crisis threatens the very sovereignty of our country.

I believe that global warming is a myth. And so, therefore, I have no conscience problems at all and I'm going to buy a Suburban next time.

When we walk away from global warming, Kyoto, when we are irresponsibly slow in moving toward AIDS in Africa, when we don't advance and live up to our own rhetoric and standards, we set a terrible message of duplicity and hypocrisy.

Many countries - as well as cities, states and provinces - are taking global warming seriously and are working to reduce emissions and shift to cleaner energy sources.

Several times in Earth's history, rapid global warming occurred, apparently spurred by amplifying feedbacks. In each case, more than half of plant and animal species became extinct. New species came into being over tens and hundreds of thousands of years. But these are time scales and generations that we cannot imagine.

The idea that global warming is the most important problem facing the world is total nonsense and is doing a lot of harm.

Global warming is real. It is happening today. It is being charted by our satellites. It is being charted by our scientists. It is being charted by those of us in this body, and I think the real key is if we are ready to admit that fact and take the action to make the necessary conversion.

One of the reasons I'm excited by what visionary Elon Musk has done with the Tesla is to show that you can reduce global warming and drive a powerful, fun car. A cool car helps make a cooler planet.

We have lost our vision for the future. Before, we say, 'Nothing will be the same. Cars will fly, and we go to the end of the universe.' We have this kind of naive but exciting idea of the future. Now, the vision has been reduced to ways to select our garbage and how to survive global warming.

Global warming is actually a misnomer. It should be global extremes and global swings, because you add - as you add more energy into the atmosphere, it sloshes around. Energy doesn't simply uniformly warm up the planet. And that means droughts in one area, enormous snowstorms in another area, 100-year floods here, 100-year forest fires there.

Dealing with global warming doesn't mean we have all got to suddenly stop breathing. Dealing with global warming means that we have to stop waste, and if you travel for no reason whatsoever, that is a waste.

There are more effective ways of tackling environmental problems including global warming, proliferation of plastics, urban sprawl, and the loss of biodiversity than by treaties, top-down regulations, and other approaches offered by big governments and their dependents.

The truth is, as most of us know, that global warming is real and humans are major contributors, mainly because we wastefully burn fossil fuels.

Roger Revelle died of a heart attack three months after the Cosmos story was printed. Oh, how I wish he were still alive today. He might be able to stop this scientific silliness and end the global warming scam. He might well stand beside me as a global warming denier.

I don't think global warming is to do with us, I think it's a natural circle. I don't think a few Ferraris make that much difference.

Given the scale of issues like global warming and epidemic disease, we shouldn't underestimate the importance of a can-do attitude to science rather than a can't-afford-it attitude.

The question of whether or to what extent human activities are causing global warming is not a matter of ideology, let alone of belief. The issue is simply one of risk management.

Science has been quite embattled. It's the most important thing there is. An arts graduate is not going to fix global warming. They may do other valuable things, but they are not going to fix the planet or cure cancer or get rid of malaria.

And then of course, obviously as far as issues such as global warming, something has to be done on the corporate side, there has to be some mandate or some legislation.

I live in New Hampshire. We're in favor of global warming. Eleven hundred more feet of sea-level rises? I've got beachfront property. You tell us up there, 'By the end of the century, New York City could be underwater,' and we say, 'Your point is?'

Climate scientists have long pointed to the Southwest as one of the places in the U.S. that is most vulnerable to global warming impacts, especially drought. And if there's one thing that even climate denialists don't dispute, dry things burn.

To be clear, climate change is a true 800 pound gorilla in the room. The effects of global warming threaten global environmental upheaval over the coming century. But for South Florida and the Everglades, it could be our death knell if urgent action is not taken.

On big issues like war in Iraq, but in many other issues they simply must be multilateral. There's no other way around. You have the instances like the global warming convention, the Kyoto protocol, when the U.S. went its own way.

I would like to see a future where artists think that they have a right to contemplate things like global warming.

Today, we can see with our own eyes what global warming is doing. In that context it becomes truly irresponsible, if not immoral, for us not to do something.

Most North Americans know that human-caused global warming is real, even if political leaders don't always reflect or act on that knowledge.

As a scientist, my attention became totally focused on global warming some 15 years ago by the elegant and powerful measurements of carbon dioxide trapped in ice cores taken as much as 2 miles deep from the great East Antarctica ice sheet.

To be clear, geoengineering won't solve global warming. It's not a 'techno-fix.' It would be enormously risky and almost certainly lead to troubling unforeseen consequences.