To prevent the tipping point after which catastrophic environmental change will happen,what needs to be done?

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The most widely accepted scientific consensus is that global greenhouse gas levels need to peak no higher than 450 ppm and start declining by 2015 to prevent catastrophic climate change. While eliminating carbon dioxide emissions would be ideal, it is not currently feasible within the next two years. And while reducing greenhouse gases below their 1990 levels would certainly help, it is not a specific enough target for preventing the tipping point. Allowing carbon dioxide emissions to reach 800 ppm would significantly increase the chances of catastrophic climate change.

To Prevent the Tipping Point After Which Catastrophic Environmental Change