- Scientists are calling on world leaders to take action on climate change after carbon dioxide levels in the atmosphere broke through a symbolic threshold, 400 ppm http://www.bbc.co.uk/news/science-environment-22491491 5 comments worldnews
- Scientists are calling on world leaders to take action on climate change after carbon dioxide levels in the atmosphere broke through a symbolic threshold of more than 400 parts per million http://www.bbc.co.uk/news/science-environment-22491491 43 comments science
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