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Human Impact on Earth Facts

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Questions and Answers

What percentage of the land surface has been transformed by human action?

More than two-thirds
Between one-third and one-half (correct)
Between one-half and two-thirds
Less than one-third

What is the increase in atmospheric carbon dioxide concentration since the Industrial Revolution?

20%
30% (correct)
10%
40%

What was the main objective of the Biosphere 2 experiment?

To study the effects of climate change on the biosphere
To test if and how people could live and work in a closed biosphere
To explore the possible use of closed biospheres for space colonization
Both b and c (correct)

What happened to the oxygen levels inside Biosphere 2?

They decreased by 0.5% per month (C) Signup and view all the answers

What other issues were observed inside Biosphere 2?

All of the above (C) Signup and view all the answers

What is the 'pessimistic conclusion' drawn from the Biosphere 2 experiment?

Earth is a closed system too, a larger version of Biosphere 2 (D) Signup and view all the answers

What is the main characteristic of a closed system, as described in the text?

Only energy is naturally transferred outside the atmosphere, and no mass enters or exits the earth. (C) Signup and view all the answers

What was one of the key lessons learned from the Biosphere 2 experiment, according to the text?

Ecology can be a science, as it allowed researchers to experiment on complex natural systems. (D) Signup and view all the answers

What was one of the challenges faced in the Biosphere 2 experiment, as mentioned in the text?

The team had to spend hours every day pulling down the overgrowth of morning glories in the rain forest. (A) Signup and view all the answers

What was one of the key lessons learned about waste management in the Biosphere 2 experiment?

Waste can be effectively recycled in a closed system. (A) Signup and view all the answers

What was one of the key lessons learned about human health in the Biosphere 2 experiment?

Humans can only survive on a calorie-restricted diet in a closed system. (C) Signup and view all the answers

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