The climate is nearing tipping points. Changes are beginning to appear and there is a potential for explosive changes, effects that would be irrevers….

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

...99 percent confident that the world really was getting warmer and that there was a high degree of probability that it was due to human-made greenh….

If we drive our fellow species to extinction, we will leave a far more desolate planet for our descendants than the world we inherited from our elder….

The 5-year mean global temperature has been flat for the last decade, which we interpret as a combination of natural variability and a slow down in t….

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

Burning all the fossil fuels will destroy the planet we know, Creation, the planet of stable climate in which civilization developed..

Planet Earth, creation, the world in which civilization developed, the world with climate patterns that we know and stable shorelines, is in imminent….

We cannot afford to put off change any longer. We have to get on a new path within this new administration. We have only four years left for Obama to….

...chief executives of large fossil fuel companies to [should] be put on trial for high crimes against humanity and nature; [Hansen] accusing them of….

It has become very difficult for anyone to argue that observed global warming is natural variability. We have good reason for being able to say that ….

Only in the last few years did the science crystallize, revealing the urgency - our planet really is in peril. If we do not change course soon, we wi….

If humanity wishes to preserve a planet similar to that on which civilisation developed and to which life on Earth is adapted, paleoclimate evidence ….

The evidence for human-made climate change is overwhelming..

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 u….

Rising carbon price is essential to 'decarbonize' the economy - to remove the nation towards the era beyond fossil fuels..