Global warming is the increase in the Earth's temperature. The main cause of global warming is the greenhouse effect. The way humans behave is the reason greenhouse gases trap more heat. Cars are the main cause of heat-trapping greenhouse gases. Global warming does not completely mean a constant increase in temperature, but is mainly a change in temperature patterns. The two main greenhouse gases include methane and carbon dioxide. Carbon dioxide and methane normally come from the Earth's atmosphere. Greenhouse gases have increased due to our human activity. Greenhouse gases are known as synthetic chemicals. Our Earth has had at least five ice ages. The very first ice age we had occurred almost 2 billion years ago. Furthermore, our most recent ice age began about 3 million years ago. The most recent ice age is still ongoing today, so technically we live in an ice age. An ice age is a long period of time when the planet is semi-cold and in some areas the earth is covered in giant sheets of ice. Brief flashes of very warm weather occur during an ice age. Sometimes during hot flashes glaciers can melt. The Medieval Warming Period occurred between approximately 950 and 1250. The Medieval Warming Period was a time when temperatures had increased in the North Atlantic region. The medieval warming period took place in the European Middle Ages. Recently, after the medieval warming period, there was a cooler period called the Little Ice Age. The Little Ice Age lasted from 1250 to the end of the 19th century. It was found that neither the Little Ice Age nor the Medieval Warming Period were global, the two only taking place in the North Atlantic region. Carbon and Me...... in the center of the paper ...... gases to be eliminated in a strong effect. Greenhouse gases trap all the heat in our atmosphere and make it warmer. Humans have let ultraviolet rays into the ozone layer. The destruction of ozone will make the Earth much warmer. The temperature is increasing at very high rates. Over the last hundred years the temperature of our Earth has increased by one degree. The temperature is rising because of what we humans are doing to the environment. Besides the greenhouse effect, one of the most harmful things to global warming is ultraviolet radiation. I agree that global warming is a moral issue because it is our fault. We must work together to prevent global warming. We need to find a better way of transportation and better ways to not increase the greenhouse effect. Works Cited www.FWL.com www.GFDL.com www.climate.org ocean.nationalgeographic.com science.opponendoviews.com