I want to highlight a few points from the IPCC's Mitigation Report (PDF). First, even the most stringent global greenhouse gas targets can be met at a cost of a mere 0.1% of GDP per year! While the report is not explicit about when action should be taken, it does say that: In order to stabilize the concentration of GHGs in the atmosphere, emissions would need to peak and decline thereafter. The lower the stabilization level, the more quickly this peak and decline would need to occur. The Center for American Progress and I have encouraged stabilizing atmospheric CO2 concentration …
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