27. Two methods used to reduce the impact of the greenhouse effect include.........

A) reforestation or planting native plants in damaged or desertified lands.

B) reducing energy consumption that relies on the internal combustion engine.

C) converting from the use of fosil fuels to solar or wind power, or hydrogen fuel cells.

D) spreading nutrients such as iron to nutrient deficient oceans to encourage the growth of photosynthetic algae.

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