The problem is not that I don't believe that we are doing our part in the climate change, I just fail to believe the urgency and drama surrounding it.
According to your numbers we would have 700 ppm in 200 years, which would still be only half of the 1500 ppm we had 50 Million years ago.
Long term we are suspected to slowly move out of the ice age cycle, however if we actually see an outbrake over 700 ppm I would start to get concerned as well, but for now there are much more pressing environmental issues then CO².
I am actually not fond of the oil and coal industry raiding our resources, but that got nothing to do with CO² and much more with limited natural resources. Fossil Carbon is also a soup of our ancestors, that we burn, if you wanna go all spiritual on it.
too bad it's not 50 million years ago ;)
The urgency is simple: It is a snowball effect. You have to stop it before it gets too big, and that time window is already nearly closed. And if we really are getting into a warm time, then it is even more urgent.
But again, even if the climate thing is total bullshit, the worst that can happen is that we get an slightly overpriced nicer earth. If you compare that to all the other overpriced stuff that many people buy and that only makes them less happy, that is still an improvement.
The only thing that really bugs me is the centralized global aspect of all the climate agreements. I would not be willing to pay the price of establishing a world government. ;)
I put solar panels on my house so its better for the environment. Then I find out about #SolarCoin which is a non-governmental incentive for solar PV and the clean energy future. We are showing governments how decentralized community action can reduce (and one day I hope replace) the need for FiT or other incentives.
Although SLR is not a carbon credit, it is strong evidence of clean energy and may become a proxy at some point.