气候变化是世界气候模式的长期变化，主要是由人类活动造成的。
Climate change is the long-term changes in the world's weather patterns that are mostly caused by human activity.
大气中的惰性氮是无害的，但报告说主要由人类活动产生的活性氮可能危害自然界。
Nitrogen in the atmosphere is harmless in its inert state, but the report says reactive forms of nitrogen, largely produced by human activity, can be a menace to the natural world.
这其中大部分人现在转而相信全球变暖并不是由人类活动导致这一错误观点。
A majority of people now believe - incorrectly - that global warming is not even caused by humans.
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