EARTH SCIENCE
CLIMATE AND ENVIRONMENTAL CHANGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Intentionally erupting volcanoes.
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Fertilizing an area of the ocean with iron to encourage algae growth.
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Reducing coal-based electricity consumption.
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Switching to a more fuel-efficient car.
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Detailed explanation-1: -Ocean iron fertilization (OIF), an ocean-based geoengineering technique, aims to increase the rate of atmospheric CO2 transfer to the deep ocean by stimulating the biological pump through the addition of iron (a key nutrient) to the surface of the ocean.
Detailed explanation-2: -Sperm whales have been shown to increase the levels of primary production and carbon export to the deep ocean by depositing iron-rich faeces into surface waters of the Southern Ocean. The faeces causes phytoplankton to grow and take up carbon. The phytoplankton nourish krill.
Detailed explanation-3: -Ocean fertilization proposes the addition of nutrients to the ocean surface, which ultimately controls the amount of carbon that is sequestered. Since the levels of N and P are usually greater than Fe levels, the addition of Fe into the ocean can stimulate the photosynthesis and enhance carbon sequestration [40].