全球气温变暖的主要原因：人类活动对气候变化肯定是有变化和影响的。
The main reason for global warming: human activities definitely have an impact on climate change.
气候变化已成现实，且归根结底是由人类活动所造成。
Climate change is a reality and it is down to human activities.
气候变化已成现实，且归根结底是由人类活动所造成。
Climate change is a reality and it is down to human activities.
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