Living Environment Translated Arabic 2014 | Page 86

28.Humans cause many environmental problems:
a. Deforestation- cutting down of trees- causes increased
levels of carbon dioxide which leads to global warming.
b. Carbon dioxide is a greenhouse gas that helps warm Earth.
c. Burning fossil fuels (coal, oil, natural gas) in cars and
industry leads to acid rain.
d. Over population leads to overuse of the earth’s natural
resources.
e. Humans cause air, water and soil pollution.
29. All ecosystems work toward sustainable development. This is the
practice of not using natural resources more quickly than they can
be replenished.