1. It's probably happening.
2. But there may be some benefits - like fewer deaths from hypothermia.
3. Some of it might have nothing to do with how humans behave.
4. We should be careful not to spend so much money on trying to stop it
happening that we fail to protect the vulnerable from its consequences by investing in such things as water conservation, health and education.
5. By being vegetarian, not flying, recycling, and not wasting fuel, I feel I do my bit for the environment.
6. I get sick of being lectured, by rich people who live in big houses, jet about and eat meat, about how much more I should be doing to save the earth. Incidentally, they mean 'save the earth for humans', the earth is a lot older than us and will survive anyway in one form or another.