What contributes to global warming the most

Electricity and heat: 30.6% —

Burning fossil fuels for electricity and heat is, by far, 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. These activities are the biggest climate villains, statistically speaking.

Transportation: 14.8% —

Transportation -- driving, flying and the like -- makes up nearly 15% of global climate-change pollution, according to 2012 data synthesized by WRI. It's the second-most important cause of dangerous global warming.

Manufacturing and construction: 13.3% —

Manufacturing and construction are less often discussed than transit, but they contribute nearly as much to climate change: 13.3% of emissions, WRI says. These activities are the third-biggest contributors of heat-trapping emissions.

Agriculture: 11.1% —

Likewise, our food systems are villains in the fight against climate change. Advocates say giving up meat, especially beef, would help curb greenhouse gases. Agriculture makes up 11.1% of global emissions, according to WRI.

Other fuel combustion: 8.2% —

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.

Industrial processes: 5.8% —

Industry adds 5.8% of global carbon and greenhouse gas emissions, according to WRI. Cement and aluminum production, shown here, are among the major contributors.

Deforestation and land use changes: 5.7% —

Forests trap carbon, so chopping down rainforests contributes considerably to the climate change problem. Estimates vary, but WRI says deforestation accounts for 5.7% of emissions linked to climate change. Other estimates put the number closer to 20%.

Fugitive emissions: 5.3% —

Gas flares, and other emissions associated with energy production, create 5.3% of greenhouse gas emissions.

Waste: 3.1% —

Landfills produce methane, which is a potent greenhouse gas. Our waste systems create 3.1% of global warming pollution, according to WRI.

Bunker fuels: 2.2% —

Some emissions can't be tied to a particular country. These "bunker fuels," in industry-speak, include ships in international waters as well as international flights, according to the World Resources Institute. They account for 2.2% of climate change emissions.