February 1st 2016
Professor John Jacobs
Approximately 4.5 billion years before the Earth has been formed. It is very difficult to describe or flashback the millions years before what was the climate in the Earth in a particular place on particular day. However, unfortunately based on the some clues still remain in the rock, ice, trees, corals, and definitely on the fossils. Based on these clues it is clearly indicated that the Earth climate has changed many time before. There was a time period when the whole planet was covered with ice. Now the scenario has been totally changed. If we flashback just ...view middle of the document...
There are several evidences showed that the temperature was increased in the earth viz. increased sea level (in the last century Global sea level rose about 17 centimeters); increased Global temperature; increased warming of oceans; increased shrinkage of the ice sheet; decreasing the Arctic sea ice; glacial retreat (e.g., Alps); increased the incidence natural calamities; increased ocean acidification, and finally decreased snow cover.
All these evidences for increased are due to the result of humans are emitting more CO2 into the atmosphere and absorbed into the oceans. CO2 and other greenhouse gases go through a natural cycle. The carbon is the feedstock for making the plant and the oxygen (O2) is released into the atmosphere. After the plant dies and the carbon is combined with O2 through microbial processes to become CO2 and is returned to the atmosphere. The current rate of increase of greenhouse gas levels in the atmosphere is uncountable. (epa.gov)
In the ancient era the greenhouse gasses, like CO2 and methane have been maintained the climate...