Oh no, not the hockey stick again!
This particular graph isn't the infamous "hockey stick".

Quote Originally Posted by Crazed Rabbit
Proof? Thought not.
Of course there are natural causes for global warming too; it's just that humans are contributing to it.

See for yourself. Compare fossil fuel emissions with rising temperatures.
http://news.bbc.co.uk/hi/english/sta...nce/warmer.stm

http://www.newscientist.com/channel/...e-or-myth.html
First, the basic physics. It is beyond doubt that certain gases in the atmosphere, most importantly water vapour and carbon dioxide, trap infrared radiation emitted by the Earth's surface and so have a greenhouse effect. This in itself is no bad thing. Indeed, without them the planet would freeze. There is also no doubt that human activity is pumping CO2 into the atmosphere, and that this has caused a sustained year-on-year rise in CO2 concentrations. For almost 60 years, measurements at the Mauna Loa observatory in Hawaii have charted this rise, and it is largely uncontested that today's concentrations are about 35 per cent above pre-industrial levels (see Graph).

The effect this has on the planet is also measurable. In 2000, researchers based at Imperial College London examined satellite data covering almost three decades to plot changes in the amount of infrared radiation escaping from the atmosphere into space - an indirect measure of how much heat is being trapped. In the part of the infrared spectrum trapped by CO2 - wavelengths between 13 and 19 micrometres - they found that between 1970 and 1997 less and less radiation was escaping. They concluded that the increasing quantity of atmospheric CO2 was trapping energy that used to escape, and storing it in the atmosphere as heat. The results for the other greenhouse gases were similar.
Maybe you'd care to read about this then?
http://scrippsnews.ucsd.edu/article_...rticle_num=666
http://www.timesonline.co.uk/article...489955,00.html
...[the study] found that natural variation in the Earth’s climate, or changes in solar activity or volcanic eruptions, which have been suggested as alternative explanations for rising temperatures, could not explain the data collected in the real world. Models based on man-made emissions of greenhouse gases, however, matched the observations almost precisely.
It's only a hard fact to face up to if you've been holding your fingers in your ears and screaming to avoid listening.

After reading some of the reponses here I'm actually glad that people are thinking of things like this space shield; "crazy" solutions like this may be our only hope if the issue is ignored and drastics steps are not taken to reduce global CO2 emissions soon.