Everyone knows that, right? 
Here's an example:
We know that there have been major changes in the world's climate and environment in the past. For instance, in this country, you could grow vines as far north as Edinburgh in Roman times and fossils and serpents have been found from even more ancient times. But the changes which we are talking about now will occur at a faster rate than anything our natural world has known in the past. One of the effects could be a great migration of animal and plant life and possibly the loss of some of them altogether. The calculation has been made that a one-degree rise in temperature would, over time, lead forests to move 100 kilometres further north and some ordinary farming crops may move as much as 200-300 kilometres.
Man's activities are already adding greenhouse gases to the Earth at an unprecedented rate, with inevitable consequences for our future climate. The annual accumulation of carbon dioxide reaching the atmosphere is of the order of three billion tonnes and half of all the carbon dioxide emitted since the Industrial Revolution is still in the atmosphere - and all this while we are at the same time destroying tropical forests, which are a vital way of taking carbon dioxide out of the air and storing it.
We shall only be able to deal with the problems by a giant international effort in which we all cooperate
With the work done by the Inter-Governmental Panel on Climate Change, we can now say that we have the Surveyor's Report and it shows that there are faults and that the repair work needs to start without delay. The problems do not lie in the future - they are here and now - and it is our children and grandchildren, who are already growing up, who will be affected.
Discharges of carbon dioxide and CFCs, if unabated, will go on accumulating in the atmosphere and could not easily be reversed. Even the most urgent measures now cannot fully repair the damage of the past but action now will prevent the problem from becoming acute and give us time to improve our predictions and enlarge our understanding.
Who said that, then? Only Margaret Thatcher. The truth is revealed! Thatcher is secretly a leftie Commie pinko environmentalist after all! Of course, there is a twisted logic to it all, apparently.
