American - Scientist | March 29, 1941 -
Global warming isn't a prediction. It is happening.
James Hansen
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Recent warming coincides with rapid growth of human-made greenhouse gases. The observed rapid warming gives urgency to discussions about how to slow greenhouse gas emissions.
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The trains carrying coal to power plants are death trains. Coal-fired power plants are factories of death.
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Adding CO2 to the air is like throwing another blanket on the bed.
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Climate change is analogous to Lincoln and slavery or Churchill and Nazism: it's not the kind of thing where you can compromise.
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What has become clear from the science is that we cannot burn all of the fossil fuels without creating a very different planet.
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It's as certain that as long as fossil fuels are the cheapest energy, we will just keep burning them.
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On a per capita basis, Britain is responsible for more of the carbon dioxide now in the atmosphere than any other nation on Earth because it has been burning it from the dawn of the Industrial Revolution.
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Scientists will say we can't blame global warming for any single event. In a sense that's right, but the fact that the frequency and intensity of these events is increasing you can blame on global warming.
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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.
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Tipping points are so dangerous because if you pass them, the climate is out of humanity's control: if an ice sheet disintegrates and starts to slide into the ocean there's nothing we can do about that.
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As a government employee, you can't testify against the government.
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