An increase in human population leads to environmental issues such as pollution. This is because when there is an increase in population there would be an increase food resources therefore would have more pollution as well as higher gas emissions.
It was and still is the Hindu Kush Mountains. Stretching about 500 mi across.
Hydrogen is used by plants which combine it with carbon during the photosynthesis process and release oxygen into the atmosphere which is used by all living beings.
