Global warming is not only the No. 1 environmental challenge we face today, but one of the most important issues facing all of humanity. We all have to do our part to raise awareness about global warming and the problems we as a people face in promoting a sustainable environmental future for our planet. (Leonardo DiCaprio)

Global warming is not only the No. 1 environmental challenge we face today, but one of the most important issues facing all of humanity. We all have to do our part to raise awareness about global warming and the problems we as a people face in promoting a sustainable environmental future for our planet.

Leonardo DiCaprio

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challenge face facing future humanity people planet raise sustainable warming today awareness global environmental

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Climate change is a global problem. The planet is warming because of the growing level of greenhouse gas emissions from human activity. If this trend continues, truly catastrophic consequences are likely to ensue from rising sea levels, to reduced water availability, to more heat waves and fires.

Malcolm Turnbull

To prepare adequately for the challenge of global warming, we must acknowledge both the good and the bad that it will bring. If our starting point is to prove that Armageddon is on its way, we will not consider all of the evidence, and will not identify the smartest policy choices.

Bjorn Lomborg

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.

Mike Huckabee

A consensus has emerged in our scientific community that global warming is no longer merely a theory but a reality, a crisis with truly global implications for planet Earth and all of us who share it. - Told to thousands at the New Jersey concert for Live Earth.

Leonardo DiCaprio

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.

John Coleman