http://dailycaller.com/2014/04/14/un-says-the-world-needs-cap-and-trade-carbon-taxes/
In order to keep global temperatures from rising above two degrees Celsius by 2100, the world needs to lower its use of fossil fuels, like coal and oil, between 40 percent and 70 percent. This can be done by acting immediately and putting a global price on carbon dioxide emissions, either through a tax or cap-and-trade system, according to the UN.
