ENVS 80b.2005.assignment.3

ENVS 80b.2005.assignment.3 - ENVS 80b: Ecological Forecast...

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Fall 2005 Assignment #3 due in class November 17 PART ONE : 1. You bump into a friend at the College Eight bus stop after class, as she is waiting to catch a bus into town. When you mention that you have just come from ENVS 80b, she says to you, “Oh, dear. I’ve heard that Earth warming will actually have a positive effect on plant growth and crop production. So it sounds to me like global warming is a good thing as it is going to eventually feed all the hungry people on the planet. So why do folks seem to think that global warming is a problem?” Provide two reasons , grounded in the course material, why global warming impacts on agriculture and biodiversity may not be as positive as your friend believes. Be clear and concise , as your friend’s bus may arrive momentarily (12 pts): Global warming impacts on biodiversity aren’t so positive when considering that coral bleaching is occurring because of warming waters. Coral reefs have a symbiotic relationship with photosynthesizing algae, and temperature stress often breaks up this relationship, leaving the corals without pigment (Griffith 2005). Since coral reefs contribute greatly to oceanic biodiversity, the impact is highly negative. Another negative impact is the lack of natural plant adaptation due to global warming. Since plants must shift to different temperature zones in order to adapt to climate change, the fact that the climate is changing so quickly limits how much natural shifting can take place. 2. Examples of climate change impacts on biodiversity include (6 pts): a. Intertidal community shifts b. Changes in timing of bird migrations c. Coral bleaching d. mass extinctions e. Changes in elephant reproduction f. All of the above 3. A. What portion of sea level rise is due to thermal expansion of ocean water (6 pts)? a. 1.7% b. 30% c. 54% d. 70% e. 98.6% f. a and d (b) What other main factor accounts for the remaining portion of sea level rise (6 pts)? Melting polar ice caps and glaciers account for the other third of sea level rise from human- induced climate change. 1
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This note was uploaded on 04/15/2008 for the course ENVS 80B taught by Professor Boykoff during the Fall '05 term at UCSC.

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ENVS 80b.2005.assignment.3 - ENVS 80b: Ecological Forecast...

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