Global warming 
Vrsta: Seminarski | Broj strana: 16 | Nivo: Fakultet za bezbjednost i zaštitu, Banja Luka

Contents:
1. Introduction 3
2. Global warming 4
2.1. The Greenhouse Effect 5
2.1.1. Greenhouse gases 6
2.1.1.1. Carbon dioxide 7
2.1.1.2. Methane 8
2.1.1.3. Nitrous oxide (N2O) 9
2.2. Climate models 9
2.3. Attributed and expected effects 11
2.4. Responses to global warming 12
3. Conclusion 15
4. Literature 16
Introduction
Global warming is when the earth heats up (the temperature rises).  It happens when greenhouse gases (carbon dioxide, water vapor, nitrous oxide, and methane) trap heat and light from the sun in the earth’s atmosphere, which increases the temperature.  This hurts many people, animals, and plants.  Many cannot take the change, so they die. Global warming is affecting many parts of the world.  It makes the sea rise, and when the sea rises, the water covers many low land islands.  This is a big problem for many of the plants, animals, and people on islands.  The water covers the plants and causes some of them to die.  When they die, the animals lose a source of food, along with their habitat.  Although animals have a better ability to adapt to what happens than plants do, they may die also.  When the plants and animals die, people lose two sources of food, plant food and animal food.  They may also lose their homes.  As a result, they would also have to leave the area or die.  This would be called a break in the food chain, or a chain reaction, one thing happening that leads to another and so on.
Global warming
Global warming refers to an increase in the Earth’s average surface air temperature. Global warming and cooling in themselves are not necessarily bad, since the Earth has gone through cycles of temperature change many times in its 4.5 billion years. However, as used today, global warming usually means a fast, unnatural increase that is enough to cause the expected climate conditions to change rapidly and often cataclysmically.
Our planet is warmed by radiant energy from the sun that reaches the surface through the atmosphere. As the surface warms, heat energy reflects back toward space; meanwhile, gases in the atmosphere absorb some of this energy and reradiate it near the surface. This is often called the greenhouse effect, named for the way heat increases inside a glass enclosure. In the greenhouse effect around Earth, the atmosphere can be visualized as a blanket that is made thicker by the action of a small amount of water vapor, carbon dioxide, methane, ozone, nitrous oxide, other gases, and soot; it thus holds in more heat, forcing air temperature higher. The scientific term for this action is, in fact, “forcing.”

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