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Untrue and misleading. The more important GWP half-life (neither concentration lifetime nor concentration half-life) is on the order of 50 years.

http://2.bp.blogspot.com/-zuRBO1uTI70/T8A40kdMWBI/AAAAAAAAC9...

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That's a graph of total heat gain / time which does not have a half-life. If you take A/10 years the A/20years them A/30 years... the graph looks like that, but you not getting warming in years 10-20 just averaging over longer time periods. Basically, it's graphing a short spike in temperatures and a rapid return to normalcy as a much slower decay.

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