The total amount of CO2 we have added to the atmosphere is ~1 trillion tonnes[1], or 280 billion tonnes of carbon. That's roughly equal or at least similar to

The total amount of CO2 we have added to the atmosphere is ~1 trillion tonnes[1], or 280 billion tonnes of carbon. That's roughly equal or at least similar to the mass of all of the carbon in plant and animal life on land. Obviously it's impossible to double the amount of plants, animals and bacteria on land. If you add in oceanic biomass, we'd only have to increase biomass by 25% overall. This is is still practically impossible and we are at a historic loss of biomass and biodiversity. Ocean acidification also makes this impossible. The scale of global warming is entirely beyond planting trees or anything else. There are 3000 tonnes of CO2 in the air for every person on earth. [1]: https://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth%27s_atmosphere#Current_concentration https://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth%27s_at...