And taken globally, increases in tropical forest carbon may be at least partly explained not by carbon fertilization, but by a recovery of carbon after past
disturbances such as fire (both natural and anthropogenic) and land clearing by
humans even centuries earlier - a factor that will
reduce sink strength over time as forests recover.
According to Ferraro, protected areas are frequently located on low productivity lands, a characteristic that
reduces the likelihood of
human disturbance even in the absence of legal protection.