http://news.nationalgeographic.com/news/2004/12/1206_041206_global_warming.html
Whether we like it or not, global warming is here to haunt us. Over the past few decades, the average temperatures for a lot of places have increased about 1.4 degrees Fahrenheit. This doesn't seem very bad but after decades of this happening, it could affect the world. During these past few decades, it has been the hottest that we have seen since around 400 years ago. If you think this is bad, average temperatures is Alaska, the west part of Canada and the east part of Russia have increased around 2.8 degrees. In these places were polar animals live, ice is evaporating. Some of these animals can only survive in these kind of conditions. Therefore it is killing some of these animals. In 2040, we could very well have the first ice-free summer. That means that all the ice in these places will eventually melt and polar animals will become extinct. For example, in 1910, the Glacier National Park had 150 glaciers and it now has only 27! Global warming is very important and shouldn't be taken as a joke. If you have been wondering why there has been so many hurricanes and tornados in the past few years, you just found your answer. Global warming is a very big part of these storms. In a report by the IPCC in February 2007, they said that it was"very likely" that humans are causing it. But, not every one believes this. This report was written by 2,500 scientists in more than 130 countries. They came to a decision that all or most of the current planetary warming has been caused by humans. Some people believe this and some people believe that everything is natural. They believe this because the earth is in a cycle that is soooo big that no one knows why Ice ages have stopped. They also don't know if there has been a global warming before. The world could cycle between these two things. I believe that this is true. The world is in a cycle were this happens every huge bunch of decades. Which one do you think is true?
