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 evidence for human-made climate change is overwhelming.

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

This notion that manmade climate change is happening is wrong.

These species lose their last options if we allow climate change to continue unchecked. Keeping the natural wealth of this planet means we must avoid dangerous climate change ? and that means we have got to reduce carbon dioxide emissions.

Climate change is obviously happening and there is obviously a man-made contribution.