they currently emit more than 30 billion metric tons of carbon dioxide each year, and every bit of c02 that goes into the air pushes the global temperature up just that little bit more. and we can'tjust flick a switch, turn everything off and kill our emissions dead, so even to get to net zero, we're going to have to start sucking huge amounts of c02 back out. dan simmons and nick kwek have been looking into carbon capture technologies to see if they really could help us turn back the clock. clock ticks. for this film, we are focusing on c02 — the carbon that is produced mainly by burning fossil fuels and is the biggest contributor to rising temperatures. for decades, we've been able to capture carbon dioxide at scale at the source it's produced. in 201a, this was the first power station to use what's called carbon capture and storage. the flue gases are diverted