It’s a ludicrous proposal, requiring these trees to be planted in other nations. And nothing to say of the logistics of keeping 1 trillion trees alive long enough to maturity. Or even to just produce the saplings and ship them. If you do the math on just raising a trillion saplings, it’s mind boggling.
True, I didn’t mean working with other nations is ludicrous, only that the largest countries by area that could host these trees are the US, China, and Russia, and we’re not best friends right now. You’d have to pick a lot of smaller area countries to cooperate and when you bring in the logistics, it goes out of control.