If you take all the easy and cheap oil and natural gas and you burn it, CO2 levels would rise to an amount which will led to a global average temperature 4K higher than "usual". Give or take a few percent, this doesn't matter. The relation between burning fossil fuels, CO2 level in the atmosphere and global average temperature is quite well known.
But just burning all the cheap oil and gas is very optimistic and highly unrealistic. We also burn lots of coal and we are developing technologies to get access to expensive oil and gas.
World politics is depating how to stop global warming at +2K. This is 100% bullshit now. It is already impossible to stop it at +2K. To do so we would have to let half of the cheap oil and gas (and all of the coal) sit idle in the underground forever.
So we will end up with global warming and people will argue that it doesn't matter. Come on, 2K or 4K more wouldn't harm you so much, would it?
Of course it will, at least to the average person in the world, but those people affected in other countries or in the future have no lobby now. We accept to save 1 US$ now for 10US$ of destruction later. That's our nature.
Maybe we need a "Fukushima event" in the climate sector. Something happening that will show the poeple the costs of a warming world. Maybe a Hurrican in Europe, maybe the middle of the US drying to dust with forest fires burning for several months, maybe a Malaria epidemic, sand storms throughout China, whatever...
It sure need something much more powerful than Sandy. Nobody knows if this storm is related to climate change (and truth it that likely it isn't) and most people will have forgotten it in just 1 year.
The question is not: Can we afford climate change? The question is: How do we afford climate change. There is no "if" left in that debate any more. Maybe we had a chance 10 years ago, if we would have tried really hard, we sure would have had a chance 30 years ago.
Today? Zero chance. Zero.
(except a super SHTF event that will destroy the entire industry of the world, of course, but this is doomer porn)
Btw, at +7K which is unlikely to happen during our lifetime, but is entire possible in the next century, many places simply would become inhabitable to humans.
Thermogeddon:
http://barringtonstewart.wordpress.com/ ... or-humans/best regards