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Science, Tech & Environment

Rising carbon dioxide levels may reduce the nutritional value of important foods

Rising levels of atmospheric CO2 are already having significant impacts on climate, weather patterns and water supplies. Scientists expect increased carbon dioxide levels will also affect agriculture across the world, in ways we can't predict. The results of a recent study suggest that one of those affects could be quite alarming.

Science, Tech & Environment

After a long journey from Africa, a new tropical disease sets up shop in Florida

A nasty tropical disease that causes extreme joint pain and can leave sufferers unable to sit up for weeks has shown up in the US for the first time. Florida health officials say at least two cases of chikungunya appear to have been transmitted by local mosquitoes, and a reporter who's been covering the story says officials fear a wider outbreak.