So temperature is to rise by 2.5 degrees in the next 50 years. This is hypothesis not fact. Measured temperature in the tropics has not risen at all in the last 30 years so what conditions have changed to make it leap up in the next 50 years. Journalists need to stop regurgitating second rate research and need to ask the question "how do you know that for sure?"

Oh yes, and what temperature to we want to adjust the earth to? Of course, all we have to do is control the amount of CO2 in the atmosphere, and we can come up with any earth temperature we want. Is that what IPCC is saying?

Where is this evidence? Global Mean Temperature hasn't risen in at least ten years in spite of increasing CO2 levels. These are computer simulations based on guess work and assumptions. One of the leading world climate research Institutes is the Hadley Centre. I 2005 this is what they said in a document:Stabilising climate to avoid dangerous climate change ��� a summary of relevant research at the Hadley Centre January 2005What constitutes ���dangerous��� climate change, in the context of the UN Framework Convention on Climate Change, remains open to debate. Once we decide what degree of (for example) temperature rise the world can tolerate, (how would they know?) we then have to estimate what greenhouse gas concentrations in the atmosphere should be limited to, and how quickly they should be allowed to change. These are very uncertain because we do not know exactly how the climate system responds to greenhouse gases.The next stage is to calculate what emissions of greenhouse gases would be allowable, in order to keep below the limit of greenhouse gas concentrations. This is even more uncertain, thanks to our imperfect understanding of the carbon cycle (and chemical cycles) and how this feeds back into the climate system.On flimsy knowledge such as this scientists build empires, politicians raise taxes and the people pick up the bill.