> people can take personal action
They can, but it won't help. Just watch Mythbusters to understand that things you don't consume will be consumed by someone else. When we need to divide our emissions by 10, people who make an effort won't offset people who don't.
Carpooling won't help enough. Economy cars won't help. Renewable heating won't help. Wind turbines won't help. All of that together will never even divide your consumption by 2, plus since we save money by using less energy, we have more money available that we spend on other carbon-emitting products. We need everyone to take action, so that the ecologist worker isn't disadvantaged in his life compared to the meat/petrol/flight/wasteful worker. Let's look at the numbers:
- Nature absorbs 3GtC per year [1] (Giga-tons of carbon. 1t of Carbon = 3.7t of CO2).
- We'll be 9 billion people on Earth in 2050, so each human can emit 0.333tC per year (or 1.23t of CO2). The argument that some (USA) consume more than others (Philippines) is offset by the facts that the development of most poor countries is soaring (hear: China will access the consumer market just like USA) and the poor also use inefficient and polluting processes.
- So our goal is 1.23t of CO2 (=0.333t of carbon) per person per year. We emit 22t of CO2 per year in USA, 9t in France, 5.5t in Romania and 4t in China. You can calculate the rate for yourself [3].
And that's only to come back to nature-reasonable footprints. If we want to offset the carbon that's already in the air, we need to make even more effort.
So the effort in every industrialized country is to divide our emissions by ~10, which is unreachable by simple personal action.
[1] https://www.manicore.com/anglais/documentation_a/greenhouse/...
[2] http://carbonfootprintofnations.com/content/environmental_fo...
[3] http://www.carbonindependent.org/ - Carbon footprint calculator
Since you too believe in the power of markets, a huge tax on carbon will advantage those who emit fewer CO2 and will be much easier to manage for corporations than any regulation. It has to be offset by lowering other taxes, so we don't increase the global tax pressure on the economy. It just has to be high enough so that all the cost of global warming weighs on CO2 emitters only, which probably means some types of jobs (e.g. half of car factories) belong to the past. But it's either that, or a global warming that creates such pressure on our civilizations that we might live in endless wars.