Climate change: Uncharted waters?

Climate change is our biggest environmental challenge, says the UK Prime Minister, Tony Blair. His chief scientific adviser, Sir David King, calls it a far greater global threat than international terrorism.

There is wide though not unanimous agreement from scientists that they are right. It is certainly possible that warming temperatures could take the Earth into uncharted waters, even though nobody can say exactly how fast it may happen and who will be most affected.

Life on Earth exists only because of the natural greenhouse effect, the ability of the atmosphere to retain enough heat for species to thrive (and no more).
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