Leaded fuel in the form of lead gasoline is banned recently due to its extremely harmful effects on health and pollution caused by it. Combustion of leaded petrol leads to release of lead in the environment causing dangerous effects on the health of all living organisms and environmental pollution. 

When marine organisms die, their bodies sink into the sediments at the bottom of the ocean. The carbon from their bodies is released which forms marine sediments that arc the largest store of carbon on earth.

Anagenesis and cladogenesis are the two main ways speciation occurs. One involved the slow transition of one species to another. Cladogenesis involved the separation of a species into two or more groups, with each group then becoming its own separate species.

Humans cause a lot of destruction to the natural world, through deforestation, starting forest fires, farming, and building things. So, when we destroy the environment making it unstable, we allow a new environment where secondary succession begins to take place. It is still slow, and habitats take hundreds of years to rebuild, and often are nothing like the habitat before it.

Melting of mass ice, glaciers around the world have caused increase in the sea level. The global warming is the main reason for the melting of ice, which are also a big reservoir of fresh water.