It is clearly the effect of human activity.

人类活动的影响是很明显的。

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Due to fewer rainfall, lean soil, serious soil and water loss and the long term negative effect of human activity, the ecological environment in hilly semi arid area is being degraded.

低山丘陵半干旱区气候干旱、土地贫瘠、水土流失严重，加上人类活动的长期负面影响，使得该地区生态环境不断恶化。

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Today, we realize, perhaps more than ever, that the world of human activity also has its own "Butterfly Effect" — for better or for worse.

今天，我们认识到，或许比以往任何时候都认识到，人类活动世界也有自己的“蝴蝶效应”，是好是歹，都要面对。

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Some of the warming is obviously the result of human activity, but our effect on the global climate remains unclear.

FORBES: Global Food Wars