Even if rich countries completely curtail all emissions (an impossible scenario), overall carbon dioxide content continues to rise, and the temperature continues to rise with it. So, the temperature increase is smaller, but only a tiny bit smaller. Even after eight decades, the difference is just below 0.8°F.1 Since the United States emits just over 40 percent of rich country carbon dioxide, in this scenario the effect of just the US going to zero fossil fuels from today onward would be a reduction in temperatures of about 0.33°F in 2100.
