21. describe some of the main issues that involve our environment, and provide examples of how these issues affect our environment.

One of the main issues that involve our environment is global warming, which lead to the climate change hence causing many problems:

Ice cap melting- As the atmosphere become thicker given the increasing emission of carbon dioxide from manufactories,heat is trapped within the Earth’s surface. This has caused the ice cap in the North pole and South pole to melt. The reduce of ice cap is an affect of global warming on the environment, and it also cause the sea level to rise, increasing the chance of flooding.

Tropical cyclone- Tropical cyclones are more likely to be formed as the temperature rise. They greatly affect the coastal countries/cities and damage the environment with extremely strong wind. For example, many infrastructure like houses and cable has been damaged as typhoon mangkhut swept through Japan.

Hope it helps!

The answer is the magnetosphere.