![](http://static.ddmcdn.com/gif/north-pole-250.jpg)
Scientists expressed alarm on Monday over the rapid
acidification of the Arctic Ocean caused by carbon dioxide emissions.
![](http://static.ddmcdn.com/gif/mauna-loa-250.jpg)
The proportion of carbon dioxide in the atmosphere is set to
break 400 parts per million this month, levels not seen in 3 million
years.
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