There are many reasons that people think global warming could be caused by humans For the last century, we have been destroying our natural resources. Newspaper headlines and magazine articles have many people convinced that global warming is anthropogenic, or human caused ‘[;
carbon dioxide (in the atmosphere) is at levels higher than ever before, and carbon dioxide is a greenhouse gas, so it’s reasonable to say that there’s warming associated with the increase of carbon dioxide. But you can’t make the leap yet that all the cars in the world have led to what we’re observing in the thinning of the Greenland ice sheet.” said Dr. Waleed Abdalati,
Global warming has been blamed on many different natural causes. Around 1,000 A.D. until 1950 A.D. there were very large temperature deviations. This has partly been explained by volcanic eruptions and changes in the sun. Around these times, people did not have the technology to impact the Earth in that way.
“These samples suggested that a natural accumulation of snowfall might be to blame,” said Dr. Mosley-Thompson, a research scientist for Byrd Polar Research Center at the Ohio State University. Some scientists are also blaming ocean currents. From 1990-1996, a flux of warm water into the North Atlantic as part of the North Atlantic Oscillation may hold some evidence. The earth could also be warming as a response to last glacial period around 10,000 years ago. Global cooling was also a big deal from the 1940’s to the late 1970’s. Many tests have been performed to try to prove theories about global warming. Scientists cannot perform experiments on the earth’s atmosphere. They conduct these experiments in small models under controlled conditions. They change the conditions to see how things react. They also run computer simulations of global climate, although it is impossible to create a perfect model of our climate. “The system is too complex, even the most complex climate model doesn’t get it right”, said Mosley-Thompson.
Global warming is the increase of Earth's average surface temperature due to greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth.
1. Global warming is the increase of Earth's average surface temperature due to greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth. 2. Greenhouse gases keep heat close to the earth’s surface making it livable for humans and animals. However, global warming is happening largely to an over-emittance of these gases and fossil fuels (natural oil, gasoline, coal). 3. With the start of industry in the 1700s, humans began emitting more fossil fuels from coal, oil, and gas to run our cars, trucks, and factories. By driving a “smarter” car, you can not only save on gas, but help prevent global warming. 4. There is more carbon dioxide in the atmosphere today than at any point in the last 800,000 years. 5. The shifting of the earth’s plates in the Indian Ocean on Dec. 26, 2004 caused a rupture more than 600 miles long, displacing the seafloor above the rupture by perhaps 10 yards horizontally and several yards vertically. As a result, trillions of tons of rock were moved along hundreds of miles and caused the planet to shudder with the largest magnitude earthquake in...