In other words, an increase in population since ancestors of human beings started to stand upright is more than the increase since the 1950's. It was 6 times of the last half century. Especially since the 1990's, we have observed an enormous growth of the global economy, and the growth since the 1950's is greater than the growth during millenniums after the rise of agriculture. Excessive grazing makes lands lose its fertility. Coral reefs are disappearing.
Tropical forests are about to extinct.
The concentration of CO2 in the air marks an all-time high in the last 160 thousands years. The global temperature is rising, and it may cause a climate change. The more the temperature gets higher, the more water evaporates, and this might cause the climate change. The rapid climate change made 0.3 billion people lose their home. This number is more than the sum of U. S. A.'s and Canada's population.