求翻译：21世纪人类正面临着全球环境和社会可持续发展的巨大挑战。一方面人类受到不断变化的地球系统的严峻挑战；另一方面人类活动正以前所未有的幅度和速度影响着地球系统。是什么意思？

21st century is facing enormous challenges of global environmental and social sustainability.

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The 21st century humanities are facing the global environment and the social sustainable development huge challenge.On the one hand the humanity receives the Earth system stern challenge which changes unceasingly; On the other hand the humanity moves is affecting the Earth system by the unprecedente

21st century mankind is facing huge challenges in global environmental and social sustainability. Humans are changing the Earth system on the one hand challenges and on human activities at an unprecedented scale and speed of impact on the Earth System.

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