题目

BH60A6801 Sustainable.now - Online teaching (3 cr) 3.3.2025-20.4.2025 QUIZ (English)

多项选择题

For which of the following planetary boundaries has the threshold of acceptable risk been transgressed?

选项

A.a. Ozone depletion

B.b. Climate change

C.c. Ocean acidification

D.d. Loss of biodiversity

E.e. Air quality

F.f. Biogeochemical cycles

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标准答案

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思路分析

To evaluate which planetary boundaries have had their acceptable-risk thresholds transgressed, I will examine each option in turn and relate it to the planetary boundaries framework. Option a: 'Ozone depletion' — Historically there were concerns about ozone layer thinning, but the boundary for ozone depletion is considered status-quo stable and not currently transgressed in the recent framework, thanks to global policy action (e.g., Montreal Protocol). Thus, this option does not reflect a boundary that has crossed the safe threshold today. Option b: 'Climate change' — This boundary has ......Login to view full explanation

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