This is because the average temperature of the earth over the past 1,000,000 years is much cooler than it is today.
We are on the brink (within 1,000 - 5,000 years) of another LONG 'ice age'. One that lasts tens of thousands of years.
Vostok Ice Core Data from Antarctica
Assuming anthropogenic climate change is real and unadaptable at current rates:
We would have to cut our use of fossil fuels by over 90% in order to appease the climate change alarmists.
http://www.guardian.co.uk/environment/2009/oct/21/europe-carbon-emissions
Enjoy living in shanty town slums and riding donkeys between your hovel and your workplace, because that is the world they unknowingly want to take us back to at the moment.
Without a viable alternative, that is the route they want to take us. All trucks would stop running, all planes would stop flying, all ships would stop traveling, all cars would stop, all cities would empty ... the only ones with access would be the aristocracy and plutocracy that would form during the steep decline in our use of hydrocarbons and our way of life.
At least those island nations would still be above water, right? Those poor Maldives...
If you're serious about tackling climate change, then focus on a viable alternative to fossil fuels (one that can power trucks, cars, planes and ships) or else the above will occur if you get your way (drastic reduction in use of fossil fuels).
Don't get me started on wind and solar.
Wind is unreliable unless it's out in the desert or on the high seas, and then almost all of the generated power is lost by the time it reaches anywhere its needed.
Solar requires batteries to store electricity. Do you know how much energy goes in to creating a battery? The minerals have to be mined out of the earth then formed into something useful in a factory before it ever gets to be used on a solar panel. Until the power generated by a solar panel can be used to mine more battery minerals (zinc, calcium, lead acid, lithium, etc) then it is just a pipe dream.
It may be useful right now for individuals to use solar panels to save on the electric bill, however it's self-deception to think that you're cutting down on your use of hydrocarbons by using panels since they're currently manufactured with fossil fuels and mining is one of the most fossil-fuel intensive industries.