Nutrients in crops fall as carbon dioxide rises. People who don't get enough of the right nutrients are more likely to get sick. Researchers have now estimated the effects.
Proponents of postgraduate residencies say the extra clinical training boosts expertise in dealing with complex medical cases. But some nurse practitioner groups see the programs as unnecessary.
Hawaii is about to ban the sale of sunscreens containing certain chemicals that have been shown to harm coral reefs. Environmentalists urge a switch to mineral-based products.