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Bio 100 L Labs Concepts

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BIO 100L Concepts- Labs and concepts week 7
Conservation

Readings * Read chapter 34 (focus on 34.1, 34.4), 36 (focus on 36.4, 36.5) in the textbook. * Review recent information on climate change at this website http://www.epa.gov/climatechange/science/stateofknowledge.html

Introduction
The current state of the biosphere shows unsettling trends. There is a need to meet these challenges, pursue more knowledge, and work as individuals and as a society toward long-term sustainability. Recent research has sent a message that global warming may not be a hypothetical threat, but a current issue warranting immediate action (Krogh, 2009).

Global Warming
There is a steady rise in carbon dioxide in the atmosphere. It is estimated that the average carbon dioxide concentration in the atmosphere has increased approximately 17% in the past 45 years (Campbell, Reece, & Simon, 2007). It is estimated that 20% of the excess carbon dioxide released into the atmosphere can be attributed to the burning of trees after deforestation. The burning of fossil fuel accounts for another 70-80% of carbon dioxide released into the atmosphere. Global temperatures are concurrently on the rise. Carbon dioxide lets radiation through the atmosphere, but retains some of the heat it generates (greenhouse effect). When carbon dioxide increases in the atmosphere, this greenhouse effect is enhanced, and too much heat from the sun is retained in the atmosphere. Some scientists, therefore, believe that elevated atmospheric carbon dioxide levels are responsible for global warming. Increased temperatures, in turn, may have deleterious effects on various species (Issues, 2009).

Harlequin Frogs and Global Warming
In 2006, the effect of global warming came sharply into focus. Ecologist Alan Pounds and his colleagues identified a link between the warming of the planet and the extinction

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