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Bird populations are in rapid decline across North America. While climate change is just one of the many factors influencing North American birds, its effects are significant and can interact with other stressors, such as habitat loss.

A cold front swept across several western states in mid-October 2023, delivering the first significant snowfall of the season to the Rocky Mountains.

The growing season for ragweed, the main cause of allergies in the U.S., has expanded by an average of 11 days since the 1970s, an analysis shows.

While useful for killing pathogens including SARS-CoV-2, the lights may cause unwanted chemical reactions and should be used with ventilation, researchers say.

Research testing new technology to more effectively locate polar bear dens across the Arctic is showing promising results.