The ancient Sumerians modified their environment to increase food production by<span> digging irrigation canals which was a very big part of European development. </span>
Political reasons - They may have been exiled from their previous country by their government. War means they are not safe in their previous country.
Social reasons - Their life may be at risk of being taken by people from their previous country. Poverty and famine could also be a factor.
Here, ground-level or "bad" ozone is an air pollutant that is harmful to breathe and it damages crops, trees and other vegetation. ... The stratosphere or "good" ozone layer extends upward from about 6 to 30 miles and protects life on Earth from the sun's harmful ultraviolet (UV) rays.
You could conserve nonrenewable resources by not using them. Hope this helped
El Niño is a natural event that periodically weakens the
western surface of ocean currents in the equatorial pacific ocean. In an El Niño,
the wind that pushes water around (which keeps the east warm and west cold)
gets weaker making the ocean warmer, changing the air temperature and precipitation patterns in the United States.
