Taxes to deal with CO2?

If we wanted to deal with CO2, then the answer is in planting more trees. Trees eat CO2 and dish out oxygen. Winning forumla surely? We can't have easy solutions when there are clear tax-grab opportunities to seize before the public gets wise. So let's make everyone shit scared of CO2 and tax them to death. By the time they notice what's going on, it's be too late! Taxes are easily invented, yet so very rarely abolished or decreased. I really fail to see what the big deal is. Plant more trees. Why is that so hard? In around 5-10 years, we won't be obsessed by CO2 at all; it'll be something like Nitrous Oxide or Excessive levels of Hydrogen or something.