人类活动对气候的影响，可以从某个地区波及到世界任何地方，可见气候变化是一个全球性的挑战。
It is a global challenge because the consequences of climate change transcend borders - human actions in one country have consequences across the globe.
所以我们一直在讨论人类活动对气候影响的理论。
So we have been talking about theories that deal with the effects of human activity on the climate.
碳足迹是一种测量标准，衡量我们人类活动对环境，特别是气候变化的影响。
A carbon footprint is a measure of the impact our activities have on the environment, and in particular climate change.
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