martes, 17 de noviembre de 2009

Earth 'heading for 6C' of warming


Emissions rose by 29% between 2000 and 2008, says the Global Carbon Project. The Global Carbon Project (GCP) is a network of scientists in academic institutions around the world.

All of that growth came in developing countries; but a quarter of it came through production of goods for consumption in industrialised nations. Emissions from within the UK's borders, for example, fell by 5% between 1992 and 2004. However, emissions from goods and services consumed in the UK rose by 12% over the same period.

Before about 2002, global emissions grew by about 1% per year.Then the rate increased to about 3% per year, the change coming mainly from a ramping up in China's economic output, before falling slightly in 2008 as the global economy dipped towards recession.

The team believes that carbon sinks - the oceans and plants - are probably absorbing a slightly lower proportion of the carbon dioxide from fossil fuel emissions than they were 50 years ago, although researchers admit that uncertainty about the behaviour of sinks remains high.

Industrial emissions have climbed but the proportion of global emissions coming from deforestation has fallen - about 12% now compared with 20% in the 1990s.

The IPCC (Intergovernmental Panel on Climate Change, UK)plots out a number of "scenarios" - visions of how society might develop in terms of the size of the human population, economic growth and energy use - each of which comes with projected ranges of temperature rise.

http://news.bbc.co.uk/2/hi/science/nature/8364926.stm

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