Humans have reduced the number of insects, fish, birds, and animals by half in the past 50 years. Modern agriculture is depleting groundwater and destroying the soil, and soon there will be no more agriculture. The number of sperm in men has dropped by half in the past 40 years, and they will not be able to have children.
The 20th century was a time of ideological struggle. The victory of American liberal democracy in the end was said to be the end of history. However, only 30 years after the collapse of the Soviet Union, the United States is about to collapse.