JesseBerger1

= ** TOPIC 5: Describe how climate can be influenced by human activities (eg. Greenhouse gasses, depletion of ozone layer) ** =

As humans, we contribute to change in the climate due to many different factors. Driving our cars highly contribute to the change in our climate. Our cars use fossil fuel, and when they burn the fuel, they emit carbon dioxide, which gets trapped in the atmosphere, thus changing the climate.

An increase in global temperature by 0.6 degrees Celsius in the 20th century was an effect due to greenhouse gases. Using computer climate models, scientists have estimated that by the year 2100, the global temperature will increase by 1.4 – 5.8 degrees Celsius. Most scientists believe that even a small increase in the global temperature would lead to huge changes in the climate and weather. There would be a lot of storms and other dangerous events. The rise in temperature would raise the sea level and floods would occur. If the salt water reached inland we would have less freshwater.
 * 1) Factories are one of the biggest factors to changes in our climate caused by humans; they produce industrial gases that stay in our atmosphere for a very long time, which isn’t natural.
 * 2) Trees use carbon dioxide and give us oxygen in return, when we cut down forests, the carbon dioxide in our atmosphere increases.
 * 3) An increase in population means more fuels used for transportation, heating and manufacturing. Also, the higher population, the more mouths that need to be fed, which means more farming and more greenhouse gases that get released in the atmosphere.
 * 4) Smoking cigarettes also contribute to global warming because of the chemicals that are released from them. Not only that, but there are 4.5 trillion cigarettes produced every year and the cigarette butts take several years to break down leaving chemicals in the atmosphere for a while.

Although people consider the greenhouse effect as a bad thing its actually a good thing and without it we humans couldn’t survive on earth. The greenhouse effect warms our planet, the only bad thing is us humans increasing its effect and making our planet warmer.

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[|http://environment.about.com/od/globalwarming/a/greenhouse.htm']

Denny Ha comment: very good and well explained in detail.