Global warming is one of the biggest issues that face the environment, simply because it is global, and affects every thing in the globe. Scientists define Global Warming as the “increase in the average temperature of Earth's surface”. Apparently the small change in temperature has big consequences on environment. Scientists worry that human societies and natural ecosystems might not adapt to rapid climate changes. What are the causes of global warming? What are its effects on the humans, plants, glaciers, animals, marine life…etc? How can we be positive to solve this problem (people and governments)?