随着世界人口的持续增长，粮食的供应问题越来越令人担忧。
As world's population continues to grow, the supply of food becomes more and more of a concern.
我们的垃圾问题不是新问题，但随着世界人口的持续增长，它将成为一个越来越大的问题。
Our garbage problem is not new, but as the world's population continues to grow, it will become a bigger and bigger problem.
随着世界人口日益增多，生活日益富足，对能源的需求也越来越大。
AS THE world grows richer and more populous ever more energy is needed.
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