Please help!! What are some natural AND human influences on the desert biome (Like the Sahara desert)?

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Explanation:

Human impact on the biome of the desert. Humans have had an effect on the desert biome in that they have poisoned the atmosphere. All biomes, including the desert, are affected. People have also drilled in the desert for many fossil fuels, such as gasoline. This causes waste and is toxic to animals in the vicinity of oil wells.

format change of dna.