The roughest of napkin math estimates that it takes approximately 3 trillion trees(10kgCO2/yr)[2] just to absorb annual human CO2 emissions(37,857Mt/yr)[3].
1. https://www.nature.com/articles/nature14967
2. https://onetreeplanted.org/blogs/stories/how-much-co2-does-t...
3. https://en.wikipedia.org/wiki/List_of_countries_by_carbon_di...
There are enough other sites for doing that.
https://www.scientificamerican.com/article/bush-had-a-lastin...