It’s time to start talking about ‘negative’ carbon dioxide emissions.

The world’s nations have agreed, almost unanimously, to try to limit the rise of global average temperature to 2 degrees Celsius or less over preindustrial levels.

Is that still possible? Climate campaigners, scientists, and politicians frequently insist it is. All we need, they say, is political will.

But that’s not all we need. There’s something else, something we talk about much less.

You see, in order to have a reasonable chance of hitting the 2C target, modeling shows that humanity must go carbon negative in the mid-to late 21st century. Here are two scenarios developed by Oil Change International, one that offers a 66 percent chance of hitting 2 degrees, one that shows a 50 percent chance of hitting 1.5 degrees.

Read the Vox story by David Roberts - “It’s time to start talking about ‘negative’ carbon dioxide emissions.”