A new technology uses chemical reactions to lock carbon emissions into basalt rock. Some scientists are concerned that the carbon may leak out of the rock over time. They are unsure how carbon leaks might impact air and water quality. This situation is an example of which of the following challenges to sustainability? a. scalability, b. externalities, c. unintended consequences, d. increased demand.
The outcome of the technology is not anticipated by scientists and have no way of verifying its effects.
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Though kelp has the capacity to offset stores of carbon dioxide found in water, some researchers are skeptical about farming kelp to reduce ocean acidification. They believe the oceans are too large for kelp to make much of a difference. This situation is an example of which of the following challenges to sustainability? a. scalability, b. externalities, c. unintended consequences, d. increased demand.
Aquaponics combine fish farming and hydroponics. The fish provide nitrogen and organic wastes that fertilize the growing plants, while the plants filter the water for the fish. How is an aquaponics system a sustainable solution? a. It reuses wastes, while providing food. b. It saves water, while providing food. c. It reclaims polluted water, while providing food. d. It recycles water, while providing food.