We finally know where the red line for climate really is. After the rapid melt of arctic ice in the summer of 2007, our best scientists, led by NASA's Jim Hansen, went back to work and produced a series of papers showing that with more than 350 ppm (parts per million) of carbon dioxide in the atmosphere, we couldn't have a planet "similar to the one on which civilization developed and to which life on earth is adapted."

The real negotiation is between humans on the one hand and chemistry and physics on the other. And chemistry and physics, unfortunately, don't bargain.

We've been in lots of places that I suppose, by Oxford standards, would be considered illiterate, but everyone's completely conversant with the idea that here is a number, and that number is above it, and that's too high. It's not a very complicated idea.

I guess the underlying principle might be, don't make it too easy for them to stereotype you.

In reality, climate change is actually the biggest thing thats going on every single day.

If Apple is enslaving Chinese to make its iPhones, you don't need to eat the i-Phone, you need to make sure that Apple is paying a living wage to someone, and then it adds a dollar to the cost of iphones, and everybody's cool.

TV makes it so easy to postpone living for another half hour.