Now, in accounting parlance, this is what's called an avoided emissions offset.

用碳足迹计算术语来说，这叫做碳抵消。

And so avoided emissions offsets can often be purchased for less than 10 dollars per tonne of carbon avoided.

碳抵消每吨往往花费不到 10 美元。

And at Microsoft, we've experienced this, because for nearly a decade, we were a significant purchaser of avoided emissions offsets, before switching our strategy to only purchasing carbon removal.

微软就曾遇到过这种情况，因为在政策调整之前的十年左右时间里，我们都购买大宗的碳抵消，后来才购买碳移除。