Evolution is not a direct process but a stochastic process based on chance events.
Excess use of herbicides, pesticides, etc., has only resultedin selection of resistant varieties in a much lesser time scale. This is alsotrue for microbes against which we employ antibiotics or drugs againsteukaryotic organisms/cell. Hence, resistant organisms/cells are appearingin a time scale of months or years and not centuries. These are examples of evolution by anthropogenic action. This also tells us that evolution is nota directed process in the sense of determinism. It is a stochastic processbased on chance events in nature and chance mutation in the organisms.