Gregg Marland, senior staff scientist at the US Carbon Dioxide Information Analysis Center (CDIAC), which supplies emissions data to governments, researchers and NGOs worldwide.
Half of all human emissions have occurred since 1980.
The CDIAC estimates that global carbon emissions rose to 7.9 billion tonnes in 2005. That's 28%above 1990 levels. About 200 million tonnes of emissions occurred in 2005 alone.
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