now on the bbc, it's time for click. this week — catching carbon. scannable snacks. and food, made from thin air. tick, tick... we've heard the warnings for some time. they have been getting louder and louder. the question is has our time to act run out? 2020 was the joint hottest year on record. hurricanes and flash floods have battered the planet. the earth is in crisis. and maybe, just maybe, this time, something will be done.