On 21/03/13 21:56, Teignmouth wrote:
I forgot to say, there would obviously be winners& loosers,& it would be down to those countries that were able to adapt best to their change emvironment.

For example, the major wheat producing regions like Canada/USA/Russia, would all move south.

However, some parts of North Africa may become more fertile, but would those countries be able to take on the role of the countries mentioned above etc ????

It also depends on the amount of warming/cooling.

If you are talking about significant change (+/-3C) I don't think it is
obvious which is going to be worse for humanity, the warming or the
cooling. It is likely to be academic anyway, any change like that is
going to be destructive.