Introduction We have all noticed the temperatures rising over these centuries. Do you believe that human activity is responsible for global climate change? Temperatures on earth have increased approximately 1.4°F since the early 20th century. Over this time period, atmospheric levels of greenhouse gases such as carbon dioxide and methane have notably increased. The pros and cons in this debate are going to be hard to explain. Scientist told that the world at one point in time, more landmass was covered with an ice sheet. Earth now has only 10% of landmass covered in ice. So is this shrinking of the glacial ice mass due to human activity? Levels of atmospheric greenhouse gases are a direct result of human activities. Burning fossil fuels are …show more content…
Was it? Well as it occurred at a rate much faster than natural climate changes could produce. atmospheric CO2 levels did not rise above 300 ppm until the mid-20th century, over the past 650,000 years. These levels has not raised anymore than 300 ppm, until the 20th century. They have risen over 317 ppm in 1958 to 400 ppm in 2013. They say that this increase is unprecedented. An increase of 10 parts per million might have needed 1,000 years or more to come to pass during ancient climate change events. Climate models predict that by the end of the 21st century, an addition of 5°F-10°F of warming will occur. So as you can see, it is rising and the cause of this is human activity. If the temperatures is going to rise by the 21st century, then it will probably keep rising. Average temperatures on earth have increased at a rate far faster than can be explained by natural climate changes. When the earth first was created, it was filled with ice sheets, now only 10% of the earth is covered with ice. So this is proof that something is creating global warming, and scientist are starting to believe that it is human activity. There was a study and it created the famous “Hockey Stick” graph. This graph shows the rise of earth's temperature over the decade, this had occurred at a faster rate than any warming period over these centuries. In the past 13,000 this has been the fastest