United Press International: A team of Spanish and German scientists has simulated the Earth’s climate during the Last Glacial Maximum, which occurred about 21,000 years ago. Such simulations, the researchers said, are a challenge for climate modeling, especially for the Atlantic meridional overturning circulation, or AMOC, that regulates climate by distributing heat to the world’s oceans and involves deepwater formation in the North Atlantic. To characterize the AMOC during the LGM, models must accurately …