我们释放的碳都去哪儿了?
-
0:02 - 0:04我们释放的碳都去哪儿了?
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0:04 - 0:08碳在自然循环中发挥着重要作用,
它存在于万物之中: -
0:08 - 0:11土壤、海洋、大气,
-
0:11 - 0:13也存在于地下深处的岩石中。
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0:13 - 0:16当植物和其他生物死亡时,
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0:16 - 0:19它们所储存的大部分碳
会回到大气中, -
0:19 - 0:22直到新的植物生长出来,
并重新吸收这些碳。 -
0:23 - 0:25但是经过数百万年,
-
0:25 - 0:29一些储存在古树
和海洋生物中的碳变成了岩石, -
0:29 - 0:31另一些则变成了化石燃料:
-
0:31 - 0:34比如煤、石油和天然气。
-
0:34 - 0:37像火山爆发这样的自然事件
-
0:37 - 0:39会释放一些固定在岩石中的碳。
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0:39 - 0:42人类活动,如燃烧化石燃料,
-
0:42 - 0:46也会释放一些史前积累的碳。
-
0:46 - 0:47如今,人类每年释放的碳
-
0:47 - 0:52是地球上所有因火山喷发
导致的碳排放量的 60 多倍。 -
0:52 - 0:55这使得地球的碳循环严重超载,
-
0:55 - 0:56并开始在大气
-
0:56 - 0:57和海洋中积累。
-
0:57 - 1:03种植更多的树会有所帮助,
但并不能实现净零排放。 -
1:03 - 1:05阻止全球变暖只有一个明确的方法:
-
1:06 - 1:09我们必须停止向空气中
释放多余的碳。 -
1:15 - 1:17[ “倒计时”
-
1:17 - 1:19请登陆 COUNTDOWN.TED.COM,
针对气候变化采取行动 ]
- Title:
- 我们释放的碳都去哪儿了?
- Speaker:
- Kristen Bell + Giant Ant
- Description:
-
- Video Language:
- English
- Team:
closed TED
- Project:
- TEDTalks
- Duration:
- 01:19
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