单词：parts per million carbon
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And by the time you all reach your billionth second here on earth when you're a little over six months into your 31st year 你们也会等到十亿位变动的那一刻到时你们大约是31岁半过一点 We will probably be over 9 billion and perh
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This is Scientific American's 60-Second Science, I'm Christie Nicholson. Got a minute? During the last ice age our problem was too little carbon. Unlike today where too much carbon is causing global warming. Past glacial ages occurred partly because
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By 1958, when people in lab coats started to pay attention to it, it had risen to 315 parts per million. 到1958年实验室人员开始重视这个问题的时候，那个数字已经上升到百万分之三百一十五。 Today it is over 360 parts
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