Monday, April 11, 2011

Global Warming Is Real

Since the beginning our planet has seen many cool & warm times depending upon the amount of light it receives from the sun due to minor shifts in its orbit, changes in atmosphere & energy of the sun. But now , another force has entered the equation &  has started to influence Earth’s climate: Human race.

Global warming actually is the unusual increase in Earth’s atmospheric temperature over the past century primary cause of which is increase in the greenhouse gases released by people burning fossil fuels. Earth has experienced such warm times in the past but this time it is happening faster then ever before. We believe that this change is not natural this time because throughout earth’s history before the Industrial Revolution, the climate changed due to multiple natural causes not linked to human activity. These natural causes are still in action today, but their magnitude is too small to justify the temperature rise seen in recent decades.

Global Surface Temperature:
Since about 1950, planet's surface temperature has seen a rise of more than .6 degrees Celsius or just over 1 degree Fahrenheit.

Arctic Sea Ice:
The image below shows a decline of nearly 32% in the Arctic sea ice.
Sea Level Rise:
When water melts it has to go some where, most of the times it ends up in oceans and lakes.
So because of the melting ice and glaciers around the world we have seen significant rise in sea levels around the globe. From 1870 to 1992, the average sea level rise has been 1.7 mm. but that has almost doubled starting in 1993.

CO2 Levels:
Carbon dioxide has been here way longer than mankind. Manmade CO2 comes from the burning of fossil fuels in factories & transport means. The following figure shows the CO2 levels measured over the past 400,000 years. Everything appears quite normal up until about 1950 where instead of going down and following the cycle, the level keeps increasing above any other point in history.
These four factors described above are quite enough to prove to someone that something is not right here, especially the rise in CO2 in the atmosphere. We need to act now before its too late.

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