Quotes from James Hansen

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.

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

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

After spending three or four years interacting with the Bush administration, I realized they were not taking any actions to deal with climate change. So, I decided to give one talk, and then it snowballed into another talk and eventually to even protesting and getting arrested.

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 climate system is being pushed hard enough that change will become obvious to the man in the street in the next decade.

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.

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

With a fourth generation of nuclear power, you can have a technology that will burn more than 99 percent of the energy in the fuel. It would mean that you don't need to mine uranium for the next thousand years.

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

Global warming has already triggered a sea level rise that could reach from 6 metres (19.69 ft) to 25 metres (27.34 yards).

The forcings that drive long-term climate change are not known with an accuracy sufficient to define future climate change.

The question is not whether to close the parks, but how to accomplish this goal.