WWII ended the great depression because it started to build jobs for people who worked on industrial stuff and it made jobs building tank, trucks, planes, ships, and weapons in the wars giving jobs to the people who didn't have any.
Overpopulation, growing cities, damming of rivers, and the desideratum for more irrigation
burning down of forests, building of incipient factories, and more cars
the utilization of major rivers in religious festivals
pollution in the Himalayan streams that drain into the region’s major rivers
95% of animals and other creatures are vertebrates in the World.
It’s the first one for sure