2011年1月18日 星期二

Focus on Effects

    The single action of cutting down trees isn’t as simple as one thinks; it could result in many severe effects. Trees are important for all species, especially human beings because they do photosynthesis. Photosynthesis is the process of converting carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. Moreover, it uses carbon dioxide and water to release oxygen as a waste product. Oxygen is vital for all aerobic life on Earth-nearly all species depend on oxygen as a source of energy either directly or indirectly. Photosynthesis can be further divided into two reactions: light reactions and light-independent reactions. In the light reactions, one molecule of the pigment chlorophyll absorbs one photon and loses one electron; in the light-independent reactions, the enzyme captures carbon dioxide from the atmosphere and enters the Calvin Cycle, which releases three-carbon sugars, and are later combined to form sucrose and starch. With more trees being cut down, the natural balance would be broken, and Earth would eventually become a planet no longer for human to live. With less trees to absorb our carbon dioxide, global warming would only become more serious, and human have to find other planets to live, which isn’t an easy thing. Everything, including technology, societies, development, etc, would only have to start all over again once natural disasters occur more often.

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