Of the following issues, which is the most significant environmental challenge facing Africa today?

Desertification is a major environmental challenge in Africa, especially in dry and semi-arid regions. Poor agricultural practices, such as overgrazing and farming that depletes soil, can reduce vegetation and soil quality, allowing fertile land to become desert-like. The best answer is B, desertification caused by poor agricultural practices. Choice D is incorrect because rising, not sinking, sea levels threaten coastal areas.

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