求翻译：同时也为人们提供了一个更洁净的自然环境，间接提高了生产要素——人力资本、土地要素等的投入质量，有利于经济效率的提高。是什么意思？

Also provide people with a cleaner natural environment, and indirectly improve the quality of the inputs of factors of production - human capital, and land elements conducive to economic efficiency.

It also provides a cleaner environment, the natural increase in indirect factors of production - labor, capital, and land elements of the quality of the inputs, and boosting the efficiency of the economy.

Simultaneously has also provided a purer natural environment for the people, indirectly enhanced the element of production - - human capital, the land essential factor and so on the investment quality, is advantageous in the economic efficiency enhancement.

At the same time also provides a cleaner environment for people, indirectly improving the production factors – human quality of inputs such as capital, land elements, conducive to economic efficiency gains.

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