Right now, 10 countries — including the U.S., China and Russia — are responsible for 80 percent of the world's carbon dioxide emissions. The United States is the world's second largest emitter (China ranks no. 1), sending around 5.8 million metric tons of CO2 into the atmosphere a year. That's the equivalent to a year's worth of greenhouse gas emissions from 1.1 billion average passenger vehicles. Below, a look at today's big CO2 emitters — and projected emissions giants in 2030.
Related: What Countries Are Doing To Tackle Climate Change