MIT did a study a few years ago to assess the economic damage that would be done globally if nations stabilized greenhouse gas emissions or even diminished them over time. They found a 25 percent drop in world GDP if the gas bags meeting in Paris actually got their way.
Economic growth for The United States would only decline about 6 percent. It’s the developing world that would get hit the worst, with China down 31 percent, India down 42.3 percent and Africa down 42.3 percent.
Note: This study was done by MIT, so scientifically speaking with libs, it must be true.