Part of it is a question of time scale. Increased greening is happening to some extent and will likely increase, but that's a response that will take hundreds o

Part of it is a question of time scale. Increased greening is happening to some extent and will likely increase, but that's a response that will take hundreds or thousands (or more) of years for enough changes to matter, and the intervening time period may be very inhospitable to most life that we're concerned about. In some ways it's almost like healing - if you're young(ish) and get severely burned, lingering scar tissue may be almost indistinguishable by the time you're 70 but that doesn't mean it has no effect on you in the years in between.