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The USA's vanishing forests
measured in units called pH. Pure water has a pH of 7 — it is "neutral" — neither acidic nor ... prevents the plant from taking up adequate nutrients and water. The trees are weakened, and may then fall ... mycorrhiza help the tree roots gather water and nutrients from the soil. But acid rain kills mycorrhiza, thus ...
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South Africa since the elections
over five years, to provide clean water to 1 million people and electricity to 2.5 million, to ... the provision of clean water and electricity to township residents, but it remains well behind what ...