Let's do some math.

TL;DR: 1 gigaton of CO2 scrubbed annually, 10% of China's annual CO2 emissions


Trees planted annually:

60,000 (people) * 45 (trees/person-day, from the commenter I'm replying to) * 365 (days/year) = 985,500,000 (trees/year)


CO2 Scrubbed Per Year (assuming 100% of trees planted survive for 40 years):

985,500,000 (trees/year) * [1 (ton of CO2 per tree over 40 years)](https://projects.ncsu.edu/project/treesofstrength/treefact.htm) = 985,500,000 (tons of CO2/year)


This is .985 gigatons of CO2, and [China is estimated to produce about 10 gigatons of CO2 per year](https://en.m.wikipedia.org/wiki/List_of_countries_by_carbon_dioxide_emissions). So, if we assume each tree lasts for 40 years and no trees die early, this will offset China's carbon emissions by around 10%. That's a great start, in my opinion. I hope they continue to invest in projects like this one and inspire other countries to do the same.


Note:

This is a huge simplification of a very complicated system, and I'm almost certainly wrong by a sizable margin, but hopefully these numbers are in the right ballpark. The figures were pulled from the commenter above (I don't know where 45 trees per day came from, I didn't see it in the article) and the first reputable-looking links I found on Google, both of which I have linked to.