450 ppm is fine. It can go a lot higher and the world will only benefit from the increased plant growth. You do want faster plant growth to compensate for ongoing desertification, right?
If faster plant growth were the only side effect you might have a point here.
Boy, it sure has been hot this month, though.
If faster plant growth were the only side effect you might have a point here.
Boy, it sure has been hot this month, though.