另一方面，如果有需要，中国还是要实行独生子女政策。

China, on the other hand if necessary, could always lift the cities' one child limit.

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例如，据官方估计，实行独生子女政策，每年减排18.3亿吨。

The one-child policy, for example, saves 1.83 billion tons of carbon dioxide emissions a year according to official estimates.

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如果他能够在上世纪50年代推行一家两个孩子的政策，今天就没有必要实行独生子女政策了。

If he had put in place a two-child policy in the fifties, today's one-child policy would not be necessary.

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