The richest 10 percent of people produce half of the planet’s individual-consumption-based fossil fuel emissions, while the poorest 50 percent — about 3.5 billion people — contribute only 10 percent. Yet those same 3.5 billion people are “living overwhelmingly in the countries most vulnerable to climate change,” according to the report.

http://thinkprogress.org/climate/2015/12/03/3727515/climate-change-economic-inequality-study/