快速而不受控制的人口增长以及由此导致的资源消耗，就算不是引起环境问题的全部原因，也是主要原因。
Rapid and unchecked human population growth and the resulting increases in resource consumption lie at the heart of most, if not all, environmental problems.
人口的增长虽然只是食品需求增长的部分原因，但是人口增长所带来的全球变暖、长期气候变化等问题仍然给农业带来了巨大的威胁。
While population growth accounts for only a modest part of the growing demand for food, it can contribute to global warming, and long-term climate change can threaten agriculture.
植被转移的可能原因包括降雨减少，人口增长及土壤肥力的下降。
Possible causes of the vegetation shift include declining rainfall, growing human population and decreasing soil fertility.
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