global warming
http://environment.about.com/od/faqglobalwarming/f/globalwarming.htm
Before this research: I only know that global warming is all about the Earth getting hotter and hotter. Then it will change the climate. But i don't know what cause Global warming.
After this research: I learnt that Global warming is cause by human activities. Human altered the chemical composition of the atmosphere through a buildup of greenhouse gases – primarily carbon dioxide, methane, and nitrous oxide. If we continue to produce this greenhouse gases, the rising global temperatures will cause sea level to rise and alter local climate conditions, affecting forests, crop yields, and water supplies. It may also affect human health, animals, and many types of ecosystems. Deserts may expand and some of our countryside may be permanently altered.
SAVE OUR EARTH!!
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