The home to mankind and millions other species is facing the biggest threat ever: global warming, which is one of the most concerning issues in today’s world. Before going any further, it is very important to understand what the term actually means. Global warming is defined as “the gradual increase in the average temperature of the Earth 's atmosphere and its oceans” by Wikipedia. It is altering the earth’s climate permanently. Global warming has had drastic effects on the ecosystem and mostly not in a positive way because now it has reached a harmful level.
The main reason of global warming is the emission of greenhouses gases, such as CO2, methane, tropospheric ozone, CFCs and nitrous oxide. This gases are responsible for creating the
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Consequences include loss of coastal wetlands and barrier islands, and a greater risk of flooding in coastal communities. Low-lying areas, such as the coastal region along the Gulf of Mexico and estuaries like the Chesapeake Bay, are especially vulnerable. Global sea level has already risen by 4 to 8 inches in the past century, and the pace of sea level rise appears to be accelerating. The Intergovernmental Panel on Climate Change predicts that sea levels could rise 10 to 23 inches by 2100, but in recent years sea levels have been rising faster than the upper end of the range predicted. The Arctic sea ice extent set an all-time record low in September 2007, with almost half a million square miles less ice than the previous record set in September 2005, according to the National Snow and Ice Data Center. Over the past 3 decades, more than a million square miles of perennial sea ice -- an area the size of Norway, Denmark and Sweden combined -- has disappeared. Multiple climate models indicate that sea ice will increasingly retreat as the earth warms. Scientists at the U.S. Center for Atmospheric Research predict that if the current rate of global warming continues, the Arctic could be ice-free in the summer by 2040. At the current rate of retreat, all of the glaciers in Glacier National Park will be gone by