There are so many other things we can do that will do so much more good, that will help people in need now, much better and much more efficiently.
The people who are still starving today are not starving because we can't feed them, but because they don't have money enough to buy food.
Lots of people say we should fly less, heat less, and put on a sweater. But it's not going to happen. People are happy to say that for other people, but not themselves.
But this is an occupational hazard of being a scientist. You say this is the best information I have and then you realize that not everyone is going to read the footnotes or the whole book, so people are going to get the wrong impression.
I'm a vegetarian, but I don't expect other people not to eat meat.
I think it's great that we have organisations like Greenpeace. In a pluralistic society, we want to have people who point out all the problems that the Earth could encounter. But we need to understand that they are not presenting a full and rounded view.
I really have to stress, I don't have a positive view. I'm not here to cheer people up. If the bottom line was negative, that is what we should say.
I certainly worry and feel uncomfortable that people I have very little in common with politically will be able to use my arguments.