"Paul Hyett" wrote in message
...

How about a graph that shows rising CO2 levels over the past couple of
centuries?

http://www.grida.no/climate/ipcc_tar/wg1/095.htm

The whole thing is worth ploughing through (whatever your viewpoint),
but what you want is section 3.2.2.4 and for the graphs, 3.2.3.2

Another one I've found useful (the whole document, but this specific
section) is:


http://www.ace.mmu.ac.uk/Resources/gcc/6-4-1-4.html

Happy reading!

Martin.