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Tropical forests nearing critical temperatures thresholds

Global warming is driving leafy tropical canopies close to temperatures where they can no longer transform sunlight and CO2 into energy, threatening total collapse if the thermometer keeps climbing, according to a study Thursday.

How feeding birds may be polluting local environments

New research led by an NAU alumnus shows that backyard bird feeders, although put out with the best of intentions, is changing the chemistry of local ecosystems, including introducing a potentially harmful amount of phosphorus ...

Japan's 'megaquake' warning explained

Japan's earthquake scientists say the country should prepare for a possible "megaquake" one day that could kill hundreds of thousands of people—although they stress the warning does not mean a colossal tremor is imminent.

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