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The number of people worldwide struggling with extreme heat and humidity by the end of the century could be more than four times as many as today if planet-warming emissions continue to rise, hiking economic losses and health costs, scientists have warned. Spending on mental health, in particular, could soar as more families have trouble sleeping and working, and heat aggravates existing mental health problems, one of two new studies found. "Heat and humidity extremes have real impacts on health and productivity," said Bob Kopp, director of the Institute of Earth, Ocean & Atmospheric Sciences at Rutgers University, and an...

A new batch of studies confirming the close relationship between global temperature and ocean level finds that seas are rising at the fastest rate since nearly 1000 BC.

A group of scientists says it has now reconstructed the history of the planet's sea levels arcing back over some 3,000 years - leading it to conclude that the rate of increase experienced in the 20th century was "extremely likely" to have been faster than during nearly the entire period. "We can say with 95 percent probability that the 20th-century rise was faster than any of the previous 27 centuries," said Bob Kopp, a climate scientist at Rutgers University who led the research with nine colleagues from several U.S. and global universities. Kopp said it's not that seas rose faster...