There are some hard figures on this and Rush is right on this one.
Appearances can be deceptive. The old forests were not doing well due to growth patterns, disease, etc. Modern forestry is very good at maximizing the growth potential for forests thus increasing them, much the same way a well planted and tilled garden produces better than randomly scattering seeds over un-tilled gound.
There's a profit motive in forestry and it works in our favor as well.