The black line is world emissions (measured in billions of tonnes). Back in 2000 the IPCC calculated some future scenarios (the coloured lines). At the moment we're tracking pretty close to the worst-case scenario, even after the GFC-dip.
The scientists reckon this will lead to around 4 degrees of warming. For the record, it is commonly accepted that anything over 2 degrees is catastrophic.
[more details in the original article]
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