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Some fossils eventually turn into fossil fuels, so when we burn them, all the carbon that has been stored up over an incredibly long period of time, gets released really quickly as co2. it is still only a tiny percentage of all the air around us, though. just over 0.04%. scientists measure that is the number of co2 parts per million in the air. injanuary, 2020, it was an average of 413.4 parts per million. but in 1970, that number was 325 and at the start of the industrial age it was roughly 280. the increase has been huge and co2 levels have been accelerating fast. they do fluctuate naturally...

Would be too cold for us to live on. but the natural world works in an incredibly delicate balance. human activity, especially over the last 50 years, has increased the amount of co2 in the atmosphere. too much of the sun's heat is getting trapped and our planet is getting hotter. so, where is all there is extra co2 coming from? in short, it is from modern life. factories, cars, aeroplanes, large—scale agriculture. they all use what we call fossil fuels, oil, coaland gas. over hundreds of millions of years, the remains of plants and animals, which are full of carbon, have been buried under t...