Global greenhouse gas emissions

In its 2014 Report, the IPCC lists global emissions of CO2 by economic sector. 31% of global emissions are due to the burning of fossil fuels (coal, oil, and gas) for the purposes of electricity generation and heating.

Global emissions CO2 by economic sector

SectorGlobal contribution
Electricity and heat production31%
Agriculture11%
Forestry6%
Manufacturing12%
Industry21%
Transportation15%
Buildings6%
Other energy10%

Source: IPCC 2014 https://www.ipcc.ch/report/ar5/wg2/
https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions