Final answer:
Afforestation refers to extensive planting of trees to increase forest cover. It helps combat deforestation and mitigate climate change.
Step-by-step explanation:
Extensive planting of trees to increase forest cover is called afforestation. This involves the process of establishing a forest, or stand of trees, in an area where there was no forest. Afforestation helps to combat deforestation, enhance biodiversity, and mitigate climate change by absorbing carbon dioxide.
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