Worldwide CO2 emissions rose at a faster rate in 2000-2004 than the worst-case scenario imagined in this year's UN reports on climate, according to new research. The rise over the first four years of this century is also greater than in the 1990s - 3.1% a year between 2000-2004, up from an average of 1.1% a year during the 1990s.
This is faster than scenarios developed by the Intergovernmental Panel on Climate Change (IPCC), suggesting even its most alarming predictions of the effects of climate change may not tell the whole story.
In a paper published in the journal Proceedings of the National Academy of Sciences, scientists said the accelerating growth rate was largely due to the increasing energy intensity of economic activity, with growing populations and economies also having an impact.
The research noted a reversal of the trend towards greater energy efficiency and lower carbon working seen in the 1990s.
"The trends relating energy to economic growth are definitely headed in the wrong direction," said Chris Field, one of the authors of the report and director of the Carnegie Institution's Department of Global Ecology. "Despite the scientific consensus that carbon emissions are affecting the world's climate, we are not seeing evidence of progress in managing those emissions in either the developed or developing countries. In many parts of the world, we are going backwards."
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