Firefire "Even half of emissions caused by humans should be enough to make changes."
Why? Anthropogenic emissions of CO2 only contribute 3% of total CO2 emissions - termites produce more CO2 than we do. In addition, CO2 is a minor greenhouse gas, making up for only about 5-7% of the greenhouse effect. It is water vapour which intercepts and bounces back 80% of the outward bound LW IR. CO2's radiative properties are also logarithmic, so it takes a doubling of CO2 to have the same effect as the atmospheric concentration increases. The latest research suggests climate sensitivity is about 1.5C at the most, which is nothing to worry about. Infact a warming of up to 2C is generally accepted as having net benefits globally. Two datasets are showing the planet has greened in the last 20 years, most likely because of the extra CO2 in the atmosphere (CO2 is essential for plant growth and more CO2 means better drought tolerance). The IPCC projections of 4-6C rise by 2100 are worse case scenarios, and political scaremongering. Global sea ice extent is much the sameas it was 30 years ago, and nothing to worry about:
<a class="break-all" href="http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/global.daily.ice.area.withtrend.jpg" rel="nofollow" target="_blank">arctic.atmos.uiuc.edu/cryosphere/IMAGES/global.daily.ice.area.withtrend.jpg</a>
It averages at about 20 million square km, so there is no shortage of ice at the poles. Glaciers have been receding in recent years, but this is just a continuation of the long slopw thaw from the Little Ice Age which ended in the late 1700s - e.g. look at how much the Alaskan glaciers retreated long before we invented cars and coal power stations:
soundwaves.usgs.gov/2001/07/fieldwork2.html
Throckenholt - I agree that the computers are not up to the job. But the whole ethos of modelling is based on assumptions and is not empirical science. Here's what the IPCC said about modelling in 2001:
"The climate system is a coupled non-linear chaotic system, and therefore the long-term prediction of future climate states is not possible."
Despite more powerful computers the models have not improved much since 2001 either:
www.drroyspencer.com/2013/06/still-epic-fail-73-climate-models-vs-measurements-running-5-year-means/
Why do you think that sceptics are only being sceptical for reasons of short term financial gain? Do you include eminent physicists like Dick Lindzen and Freeman Dyson?
And please don't lose any sleep over world population, it is very likely to stabilise at 11 billion: watch this brilliant documentary broadcast by the BBC a few years ago by Prof Hans Rosling -
If you don't have the time just watch is Ted talk, it is only 9 minutes and also brilliant: www.ted.com/talks/hans_rosling_and_the_magic_washing_machine
The world is becoming a better place, there is still much to do but climate change is not a problem we should be wasting time and money on.