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Increase in carbon dioxide emissions accelerating

New research shows the rate of increase in carbon dioxide emissions more than doubled since the 1990s.

According to the co-Chair of the Global Carbon Project, CSIRO Marine and Atmospheric Research scientist Dr Mike Raupach, 7.9 billion tonnes of carbon were emitted into the atmosphere as carbon dioxide in 2005 and the rate of increase is accelerating.

"From 2000 to 2005, the growth rate of carbon dioxide emissions was more than 2.5 per cent per year, whereas in the 1990s it was less than one per cent per year," Dr Raupach says.

He says this indicates that recent efforts globally to reduce emissions have had little impact on emissions growth. "Recent emissions seem to be near the high end of the fossil fuel use scenarios used by the Intergovernmental Panel on Climate Change (IPCC). On our current path, it will be difficult to rein-in carbon emissions enough to stabilise the atmospheric carbon dioxide concentration at 450 ppm."

Dr Raupach's figures show that while China demonstrates the highest current growth rate in emissions, its emissions per person are still below the global average and its accumulated contribution since the start of the industrial revolution around 1800 is only five per cent of the global total. This compares to the US and Europe which have each contributed more than 25 per cent of accumulated global emissions.

Dr Raupach says that the amount of emitted carbon dioxide remaining in the atmosphere fluctuates from year to year due to natural factors such as El Niño. However, he says that on average, nearly half of all emissions from fossil fuel use and land-use changes remain in the atmosphere, with the rest being absorbed by the land and oceans. "When natural variability is smoothed out, 45 per cent of emissions have remained in the atmosphere each year over the past 50 years," he says.

"A danger is that the land and oceans might take up less carbon dioxide in the future than they have in th
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Source:CSIRO Australia


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