I used to feel this way (I bike commute and only turn on our AC maybe 3-4 times a year), but I've come to believe that this idea of personal responsibility is a major fossil fuel industry talking point.

The fact is, governments around the world provide massive subsidy to all sorts of industry's that tends to support GHG production. We're never going to get this under control until we demand our representatives change the policy and incentive structures for a large majority of industry out there. It's not just cooling and cars/trucks. It's agriculture, heating, almost all of transportation/shipping, a majority of power consumption, etc.

But the entrenched powers at be want you to think that this is a personal responsibility issue, because lots of people stand to lose lots of money once we realize that the only thing that can fix this issue is a massive restructuring of worldwide government policy and incentives.