And here's our question ---
1) If cars were not invented, will there be less methane in the environment? Explain why?
2) What are the effects of absence of ozone on the Earth?
And finally here's the Bonus Question!!
1) Explain the relationship between fast food chain stores and dinosaurs with regarding to this chapter.
1) Yes, definitely. Methane is produced whenever fossil fuels are extracted. Petrol comes from petroleum, which is extracted from the earth. Most thing that require petrol to work are cars. Hence, if cars were not invented, there would be a lesser demand for petrol, and petroleum would not need to be extracted on such a large scale. As such, with lesser petroleum extracted, there would therefore be lesser methane emission and thus there would be lesser methane in the environment. Although vegetation, lakes and other natural sources would still produce methane, it is mainly human methane emission that contribute for 64% of all methane emission. Thus, if cars were not invented, there would be lesser methane in the environment.
ReplyDelete2) Even minor problems of ozone depletion can have major effects. Every time even a small amount of the ozone layer is lost, more ultraviolet light from the sun can reach the Earth. Every time 1% of the ozone layer is depleted, 2% more UV-B is able to reach the surface of the planet. UV-B increase is one of the most harmful consequences of ozone depletion because it can cause skin cancer. The increased cancer levels caused by exposure to this ultraviolet light could be enormous. The EPA estimates that 60 million Americans born by the year 2075 will get skin cancer because of ozone depletion. About one million of these people will die. In addition to cancer, some research shows that a decreased ozone layer will increase rates of malaria and other infectious diseases. According to the EPA, 17 million more cases of cataracts can also be expected. The environment will also be negatively affected by ozone depletion. The life cycles of plants will change, disrupting the food chain. Effects on animals will also be severe, and are very difficult to foresee. Oceans will be hit hard as well. The most basic microscopic organisms such as plankton may not be able to survive. If that happened, it would mean that all of the other animals that are above plankton in the food chain would also die out. Other ecosystems such as forests and deserts will also be harmed.
By: Group 4 (Duncan, Zhi Yuan, Joe, Ngai Chun)