我们不能排除这一可能性，那就是气候变化不是人类活动导致的结果。
We cannot rule out the possibility that climate change is not the result of human activities.
事实上，过去的气候变化模式表明，即使没有人类活动的影响，地球的气候几乎肯定会在未来经历剧烈的变化。
In fact, the pattern of climate change in the past reveals that Earth's climate will almost certainly go through dramatic changes in the future even without the influence of human activity.
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.
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