Evolution is good. Evolution is the process by which inferior species are replaced by superior species. If not for evolution, life would consist entirely of pond scum. It is evolution that caused pond scum to evolve into all the wonderful creatures alive today. Survival of the fittest has produced superior life forms by weeding out inferior ones.
Environmental pressure stimulates evolution.
When food is abundant, and the climate is favorable, evolution doesn t happen because every organism, no matter how inefficient it is, can survive long enough to produce offspring. It is only when times are hard that only the best survive. When the forests were replaced by tall grasses, those ape-like creatures that could walk upright evolved into Homo erectus . If not for that environmental change, we might all still be walking on four legs. We evolved from apes to people partly because of environmental changes.