These statistics from the World Resources Institute help explain what contributes to climate change. More information here: http://cnn.it/1MtdrgP
  1. Electricity and heat: 30.6%
    Burning fossil fuels for electricity and heat is the main driver of climate change. Emissions from those sectors account for nearly a third of global greenhouse gas emissions, according to the World Resources Institute.
  2. Transportation: 14.8%
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    Transportation -- driving, flying and the like -- makes up nearly 15% of global climate-change pollution, according to 2012 data synthesized by the World Resources Institute.
  3. Manufacturing and construction: 13.3%
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    Manufacturing and construction are less often discussed than transit, but they contribute nearly as much to climate change, according to the World Resources Institute.
  4. Agriculture: 11.1%
  5. Other fuel combustion: 8.2%
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    Burning other types of fuel, including wood, accounts for 8.2% of emissions. Also included in this category are fuels burned in commercial and residential buildings, as well as burning fuel for agriculture and deep-sea fishing.
  6. Industrial processes: 5.8%
    Cement and aluminum production are among the major contributors.
  7. Deforestation and land use changes: 5.7%
    Forests trap carbon, so chopping down rainforests contributes considerably to the climate change problem. Estimates vary, but the World Resources Institute says deforestation accounts for 5.7% of emissions linked to climate change. Other estimates put the number closer to 20%.
  8. Fugitive emissions: 5.3%
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    Gas flares, and other emissions associated with energy production, create 5.3% of greenhouse gas emissions.
  9. Waste: 3.1%
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    Landfills produce methane, which is a potent greenhouse gas.
  10. Bunker fuels: 2.2%
    Some emissions can't be tied to a particular country. These "bunker fuels" include ships in international waters as well as international flights.