ALEXA ST. JOHN / AP / PBS – Climate change worsened by human behavior made 2025 one of the three hottest years on record, scientists said. It was also the first time that the three-year temperature average broke through the threshold set in the 2015 Paris Agreement of limiting warming to no more than 1.5 degrees Celsius (2.7 Fahrenheit) since preindustrial times. Experts say that keeping the Earth below that limit could save lives and prevent catastrophic environmental destruction around the globe. …