In Alaska, where sea ice has shrunk to record lows in places and far-north temperatures have climbed to record highs, dozens of fires are burning the treeless tundra and releasing carbon into the atmosphere.
New Jersey declared a partial state of emergency on Tuesday as forecasts for further heavy rainfall posed new danger in parts of that state, New York and Pennsylvania, where rescuers hauled people from waterways, flooded cars and homes.
Employers and workers need to be aware that heat stress can happen well before temperatures reach official limits for workplace safety, a U.S. study suggests.
Hurricane Maria claimed the lives of 4,645 people in Puerto Rico last year and not the 64 long pegged by the island's government as the official death toll, according to a survey of thousands of residents by a research team led by Harvard University.
