Re: how worried should i be?
Don't worry.You won't notice the changes as they happen gradually.
Global warming means more energy in the atmosphere;this leads to more extreme weather e.g. flooding(globaly),worse storms than usual,hotter summers in large land masses etc.
For the Gulf stream to shut off it would take all the ice in Northern Canada to melt at once and run into the ocean. :shock: If it got hot enough to do that our climate would stay the same(cool due to no GS,warm due to GW).
Petrol is only important because the multinational oil companies keep it that way.A far less poluting ,just as effective alternative will be found when they feel like it i.e.when their profits start to fall off.
If a man is talking in the woods and there is no woman to hear him, is he still wrong?