All cities do face similar, significant trends in the future... most importantly global warming and climate change.

Some people call it global warming some people call it climate change. What is the difference?

Geoengineering - the deliberate, large-scale manipulation of the earth's climate to offset global warming - is a nightmare fix for climate change.

"If you are interested enough in the climate crisis to read this post, you probably know that 2 degrees Centigrade of warming (or 3.6 degrees Fahrenheit) is the widely acknowledged threshold for ""dangerous"" climate change."

I think Al Gore has done a great service in making global warming cool. He's basically taken it from a nerdy, almost ignored issue to making it what it is - namely, a problem.

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

Have we failed to slow global warming pollution in part because climate and environmental activists have been too polite and well behaved?

On the environmental front there's concern about global warming and high levels of carbon dioxide, and trees take in CO2 and store carbon.

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.

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The failure of world leaders to act on the critical issue of global warming is often blamed on economic considerations.

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

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.

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 this body of knowledge has evolved, a much more critical job for researchers and scientists has evolved into explaining and educating policy makers and the public to the risks of global warming and the possible consequences of action or of no action.

I was the type of guy that used to get up in the morning and go out and just out run everybody on the field without stretching or warming up or anything.

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

Nevertheless, there is another threat on the horizon. I see this threat in environmentalism which is becoming a new dominant ideology, if not a religion. Its main weapon is raising the alarm and predicting the human life endangering climate change based on man-made global warming.

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.

An audience is always warming but it must never be necessary to your work.