As is summed up nicely by the picture in roflwaffle's post, there isn't really a downside to reducing emissions.
There are financial costs for some things, but a huge amount of difference can be made by simple things like putting on a warm top before turning up the thermostat and switching off the lights when you don't need them.
In my life, I have decided that until there is real proof to whether global climate change is a real problem, I'm going to play it safe. Pretty well everything I do will save me money, so even if GCC turns out to be a miscalculation, I'll be better off in the pocket.
So much media attention is focused on how much all this "being green" will cost us, but the core message (use less energy) will save money short-term as well as long-term.
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