We've had 12 months of record-breaking global heat. How close are we to passing the 1.5 C limit?

The past 12 months have all surpassed 1.5 C above pre-industrial average temperatures, according to a new warning from the Copernicus climate research program. That isn't the same as breaching the 1.5 C limit set out in the 2015 Paris Agreement, but it's a major alarm that we're close.