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Is Climate Change caused by humans?

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Introduction

Introduction Climate Change is a term used to describe all of the inconsistencies in climate on the Earth. Nowadays, however, the term climate change is generally used when referring to changes in our climate which have been identified since the early part of the 1900's1. The main observations made when looking at climate change are changes in rainfall, wind speeds, sea levels and extreme weather conditions. These are normally affected always affected by temperature changes. Scientist have seen rises in the level of CO2 and in temperature over the last decade and they believe this is what is making climate change. ''Global mean surface temperatures have risen by 0.5-1.0�F since the late 19th century. The 20th century's 10 warmest years all occurred in the last 15 years of the century. Of these, 1998 was the warmest year on record. The snow cover in the Northern Hemisphere and floating ice in the Arctic Ocean have decreased. Globally, sea level has risen 4-8 inches over the past century. Worldwide precipitation over land has increased by about one percent. The frequency of extreme rainfall events has increased throughout much of the United States.2 Increasing concentrations of greenhouse gases are likely to accelerate the rate of climate change. Scientists expect that the average global surface temperature could rise 1-4.5�F (0.6-2.5�C) in the next fifty years, and 2.2-10�F (1.4-5.8�C) in the next century, with significant regional variation. Evaporation will increase as the climate warms, which will increase average global precipitation. ...read more.

Middle

of the gas.5 But when trees are burnt the CO2 stored in their structure is released and goes back into the air. Today, the world's forests are no longer able to absorb all the CO2 that man creates when we burn fossil fuels. Everyday over 5500 acres of rain forest are destroyed, and over 50 million acres are destroyed every year. Global CO2 levels rise approximately 0.4 percent each year, to levels not experienced on this planet for millions of years. Planting more trees and reducing timber cuts world-wide will help restore the imbalance, and perhaps buy time as ways are found to reduce world greenhouse gas emissions.5 Deforestation is definitely mans doing, and it is almost certain that the more deforesting that we do then the more CO2 there will be in the air. Population Growth The worlds Population is constantly increasing. The increase in people is also affecting climate change. As the population grows the need for services such as electricity and cars grows aswell. This boosts up the use of oil and fuel gases and therefore increases the amount of CO2 emitted into the atmosphere. As the concentration carbon dioxide increases in the atmosphere, the greenhouse effect becomes stronger as the reflected heat cannot escape the earths atmosphere as gases such as CO2 trap it. Greenhouse effect & Global Warming - The greenhouse effect is the rise in temperature that the Earth experiences due to certain gases in the Earths atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane) ...read more.

Conclusion

The warm current along the Norwegian coast keeps much of the Greenland-Norwegian Sea free of ice even in winter. The rest of the Arctic Ocean, even though it is much further south, remains frozen. Ocean currents have been known to change direction or slow down. Much of the heat that escapes from the oceans is in the form of water vapour, the most abundant greenhouse gas on Earth. Yet, water vapor also contributes to the formation of clouds, which shade the surface and have a net cooling effect. Any or all of these phenomena can have an impact on the climate, as is believed to have happened at the end of the last Ice Age, about 14,000 years ago.10 Changes in Solar Output The amount of energy that is radiated by the sun is not always constant. Even though it may seem constant to our everyday point of view, small changes can lead to climate change. There is evidence of an 11-year solar cycle (variation in energy output) in the temperature record of the Earth. Longer period changes may occur as well. 11 It is thought that the portion of the warming in the first half of the 20th century was due to an increase in the output of solar energy. All of these pieces of evidence are natural. So man cannot really do anything to stop these from happening. The only thing they could do is to prepare for things to come and to inform people of changes 9 Diagram/Text/Information taken from http://www.koshland-science-museum.org/exhibitgcc/causes06.jsp 10 Information taken from http://edugreen.teri.res.in/EXPLORE/climate/causes.htm ?? ?? ?? ?? Page 1 By Carl Josef-Ian Nu�ez Rendora ...read more.

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