The forests that have grown back are not as healthy as the old growth. In the NE of America, the oaks and transitional maples have greatly diminished. Faster growing, and invasive species have taken their place. Less diversity in the wildlife, as the new trees don't provide the same amount of shelter.

The importance of grasslands are overlooked. The prairies in NA have been turned into a monoculture nightmare. Grasses grow fast and are great at capturing carbon, providing food, and habitat for animals.