With An Eye Toward Lower Emissions, Clean Air Travel Gets Off The Ground

Electric cars are all over the roads these days. But what about electric planes?

Air travel currently accounts for only about 2% of global carbon emissions. But it's expected to grow in the next century, and clean air travel is seen as a key part of slowing global warming.

"We're expecting to see massive growth," says Umair Irfan, who writes about climate change, energy and the environment for Vox. "The International Civil Aviation Organization projects upward of 700 percent growth by the middle of the century. So while it is small, it is going to be a larger and larger share."