I"m not talking how the things we"ve created produce an immense amount of CO2, but how we as living beings naturally produce a significant amount of CO2. On average a human inhales 11,000 litres of air per day. 20% of that is air and when we exhale, of only 15% of that is oxygen. That"s around 550 litres of CO2 which would weigh about a kg. Multiply that by the current amount of living humans and the 365 days in a year and you"ll get 2,818 billion kg of CO2 produced per year. I was about to use tons but then I realised that the US has it"s own kind of ton which is 2,000 pounds but only equal to around 0.9 of the one I know that is equivalent to 1,000 kg, and that"s why I need to add this little message. That would be 3.106 billion US tons of CO2 produced just this year by humans themselves.And then the unit of measurement for emissions is in gigatons, 1 billion tons, which uses the 1,000 kg tons as a reference... So that would be 2.818 gigatons of emissions produced by humans themselves.
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With such a comparison you can begin to imagine how the 37 gigatons of CO2 produced from fossil fuel emissions in 2017 could have a significant impact on our earth.
To produce enough oxygen for a human, you would need around 10,000 leaves which should be around 300 to 500 plants.
With the added strain from fossil fuel emissions, it becomes pretty much impossible for the plants to keep up.