How have environmental factors affected human populations in the 20th and 21st centuries?
Answers
Answer:
The most serious environmental problems of the twenty-first century have the potential to alter the course of life on this planet. Global warming, toxic waste, water and air pollution, acid rain, and shrinking energy supplies are frightening challenges that may threaten our future if we do not face up to them.
The rapid increase of human population is putting an incredible strain on our environment. ... One of the largest environmental effects of human population growth is the problem of global warming. Some scientists fear that global warming will lead to rising sea levels and extreme weather conditions in the future.
Answer:
21th century
The most serious environmental problems of the twenty-first century have the potential to alter the course of life on this planet. Global warming, toxic waste, water and air pollution, acid rain, and shrinking energy supplies are frightening challenges that may threaten our future if we do not face up to them.
20th century
In the twentieth century, human action put more than gases into the atmosphere. Fossil fuel burning, metal smelting, and waste incineration released thousands of tons of potentially toxic metals into the air as dust. Human health suffered also from lead emissions, which came mainly from car exhausts.