萨尔瓦多一年生产10万吨精炼铜。
El Salvador produces 100,000 tons of refined copper annually.
由于地下水位下降，灌溉井干涸，居于世界之首的中国小麦产量，已经从1997年1.23亿吨的峰值下降了8%。
As water tables have fallen and irrigation wells have gone dry, China's wheat crop, the world's largest, has declined by 8% since it peaked at 123 million tons in 1997.
为解决这一问题，一项较为保守的计划要求在未来50年内减少250亿吨碳排放。
One of the more conservative plans for addressing the problem calls for a reduction of 25 billion tons of carbon emissions over the next 50 years.
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