The cutting of forests is used to free space to grow food we want. The disruption of a natural system has implications on the whole system. We do not know the real effects yet. Deforestation takes away the machine that makes life on earth possible. Without the oxygen produced by these forests we would die. Forrest are harvested to make space for meat production.
Since Rebearth increases yield dramatically in maize and soy, we do not need to chop away large areas of rain forests. There is no need to damage these forests for cattle feed any more, the amount of arable land is more than sufficient for the global needs, if using Rebearth in the process. Maize yield increases of over 100% are common in Africa