@Hey guys
"If the environmentalists are wrong, nothing happens, except we save some energy and do less damage to the environment"
If only that were true. The 'environmentalists' have the politicians in their pocket, however, and are throwing their weight about, so we have lunacy of 'carbon credits', taxation of anything to do with CO2 (e.g. vehicle duty) and energy police with thermal imaging cameras coming to your neighbourhood RSN.
CO2 accounts for 0.03% of the atmosphere and our contribution is 3% of that. Do you really think that's warming the planet more than the sun? As it happens, the sun is very quiet right now, and the world has been cooling for ten years, but that doesn't make the headlines somehow...
Read this for balance - the next scare will be another ice-age!
http://wattsupwiththat.com/2009/05/04/natgeo-sun-oddly-quiet-hints-at-next-little-ice-age/