Norway's musk oxen are doing well today, but just a few years ago, when temperatures reached record highs, they died in unprecedented numbers. Now scientists say that may have been a warning of what is to come if the Earth's temperature continues to rise.
About two years ago, the Maldives announced the nation would be carbon-neutral by 2020. That's a tall order for a country that spends 15 percent of GDP on diesel fuel, but work is progressing toward that goal.
To protect endangered populations of fish, scientists are devising new techniques that can identify where a fish was caught. This should enable regulators to make sure fish being sold are from sustainably harvested populations. Ari Daniel Shapiro reports.