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Our economic system, run for profit and waste and based primarily on the extractive industries, is the cause of climate change. We have wasted the earth's treasure and we can no longer exploit it cheaply.

Global warming is something that happens to all of us, all at once.

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 a fact. Now it's up to liberals to make it a reality. Hence there is crucial importance in preventing powerful, greedy free market forces from getting in the way of worsening storms and rising sea levels. The Kyoto Accord is a good first step.

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.

If you ask what you are going to do about global warming, the only rational answer is to change the way in which we do transportation, energy production, agriculture and a good deal of manufacturing. The problem originates in human activity in the form of the production of goods.

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.

I think global warming is the gravest threat. With global warming, it's the product of a war between old energy - between the carbon cronies, who, by the way, could not stay in business in a true free market capitalism.

I am convinced that policies meant to reduce alleged carbon dioxide-induced global warming will be destructive.

The fossil fuel industry is destroying our planet and everything that we love.