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- 1519073
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- 2022-5-6
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- 1970-1-1
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Main Point: the passage discusses the new study that suggests use of chemical dispersants can harm corals (even more than oil)
Key Structure:
Part I: key conlcusion + context
- state the conclusion: from a new study, chemical dispersants can cause more harm to corals than oil slicks (should only be used as a last resort)
- discuss the current practice: first, mechanic; next, chemical dispersant before oil reaching shoreline
- mention: dispersed oil droplet is harmful to coral
Part II: specific resarch- New claim (BR): dispersants kill coral and retard growth.
- Agreement with previous research: coral do better when exposed to oil slicks before oil dispersed
- Specific research discription: 3 groups (oil only, dispersants only, dispersed oil): oil only performed better than the latter two
Part III: evaluation of the reserach
- Disagreement with rule of thumb: disp is considered to be less toxic than oil (but research result showed otherwise for coral)
- Authorities to clean up spills need to consider more before using chemical dispersants
- Cast doubt / another consideration: how realistic is the testing environment (different concentration and duration)
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