Anti-Pollution Tree

One of the main pollution problems today, especially in big cities, are the huge amounts of CO2 that we produce. Basicly, every tree in the world helps to prevent that problem. My idea is, to geneticlly create huge, extremly fast growing trees, lets say 200-300 meters tall. A few of these trees, planted in a metropolin city, will convert huge amounts of CO2 to O2, eliminating smog, creating Oxygen, (maybe even grow fruits), and finally, somewhat reducing the global warming effect (if planted in a large number of cities).

The idea is with trees beacause of their high, unlike bamboo. And while were at geneticlly creating a monster tree, I think we can also make him a non polluting one.

And about waugsqueke's remark - well,i dosent seem like were going to stop soon. And part of the idea is that its focused inside the cities, to prevent smog for example. If we stop cutting down trees in south america, that wont change the situation in the big cities a few thousand kilometers away.