James Hansen Quotes

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The five warmest years over the last century occurred in the last eight years.

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.

I have been described as the grandfather of climate change. In fact, I am just a grandfather and I do not want my grandchildren to say that grandpa understood what was happening but didn't make it clear.

The United States did not sign Kyoto, yet its emissions are not that different from the countries that did sign it.

Coal is responsible for as much atmospheric carbon dioxide as other fossil fuels combined and it still has far greater reserves. We must stop using it.

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.

What makes tar sands particularly odious is that the energy you get out in the end, per unit carbon dioxide, is poor. It's equivalent to burning coal in your automobile.

As a government employee, you can't testify against the government.

Some Democrats deserve to be criticized.

We need to send a message to Congress and the president that we want them to take the actions that are needed to preserve climate for young people and future generations and all life on the planet.

What has become clear from the science is that we cannot burn all of the fossil fuels without creating a very different planet.

What is frustrating people, me included, is that democratic action affects elections but what we get then from political leaders is greenwash.

The democratic process is supposed to be one person one vote, but it turns out that money is talking louder than the votes.

You can't turn on your television without seeing these advertisements about clean coal, clean tar sands and the claim that there's more jobs associated with fossil fuels than other industries. That's of course not true. But they're hammering that into the voters' heads.

The evidence for human-made climate change is overwhelming.

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.

Climate change is analogous to Lincoln and slavery or Churchill and Nazism: it's not the kind of thing where you can compromise.

You have no time to do the science if you're talking to the media.

Talking nice about sun and wind and green jobs is just greenwash.

Until the public demands otherwise, the policy makers will continue to serve their financiers.

What we are doing to the future of our children, and the other species on the planet, is a clear moral issue.

Jail threats did not dissuade Martin Luther King - and intergenerational justice is a moral issue of comparable magnitude to civil rights.

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

We have known since the 1800s that carbon dioxide traps heat in the atmosphere. The right amount keeps the climate conducive to human life.

I've tried to be a straight scientist doing the science and reporting it as best I can.

You can't tie a rope around the ice sheet. You can't build a wall around the ice sheets.

If your child gets asthma, the fossil fuel industry doesn't pay. Or if there's a natural disaster, the bill is paid by the taxpayer, not the fossil fuel company.

The fact is fossil fuel carbon will stay in the surface climate system for millennia.

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.

I was lucky to grow up at a time when it was not difficult for the child of a tenant farmer to make his way to the state university.

Adding CO2 to the air is like throwing another blanket on the bed.

I tend to be naive and gullible, I guess, but I try to believe that governments believe what they say.

As species are exterminated by shifting climate zones, ecosystems can collapse, destroying more species.

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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