Deedaa that's why I asked JessM because the last sentence of her post at 14.21 gave me the impression she thinks global warming is caused by burning fossil fuels, when I am well aware of other factors that play a key role.
dj the amount of fossil fuels burned during the Middle Ages is a fraction of that used since the industrial revolution.
I also think it's worth mentioning that the USA never ratified the Kyoto agreement drawn up in the 90s and other countries like Canada withdrew from that agreement. And despite all the back slapping that we saw last week, just last year China, India, and the USA all said that they will not ratify any treaty that will commit them legally to reduce CO2 emissions. This is because it would be bad for their economies and that's fair enough. It's the huge steps needed to reverse this situation that is the problem. In these countries companies make vast profits using environmentally unfriendly methods and those companies are not going to willingly pay the cost of moving to environmentally friendly methods. Incentives cost money and when you are as big as China, India and the USA that means a lot of money. The USA doesn't want to lead the world when it's bottom line is at stake.
On the other hand, the EU and other countries have binding targets and have been slowly moving to achieve those targets. So at the end of the day I believe it will be the power of individual action which will make changes happen. The number of individuals in the world aware of the problems of climate change can only keep growing. We can all do our bit where possible, not just because of the environmental impact , but because it makes common sense to live that way. Our children learn about caring for the environment from a young age and this helps educate their parents. Each generation is more educated than the previous about the world in which we live. It is like a kind of growing peer pressure that touches the lives of others in many ways.
I am rambling. 