Study: More than 6 million could die early from air pollution every year

By Azadeh Ansari, CNN

Updated 2222 GMT (0622 HKT) September 16, 2015

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 <a href="http://www.wri.org/" target="_blank">World Resources Institute</a>. These activities are the biggest climate villains, statistically speaking.
Photos: What's causing climate change? Meet the top 10 villains
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.
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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 WRI. It's the second-most important cause of dangerous global warming.
Photos: What's causing climate change? Meet the top 10 villains
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.
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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.
Photos: What's causing climate change? Meet the top 10 villains
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.
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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.
Photos: What's causing climate change? Meet the top 10 villains
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.
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