James Hansen sits for a portrait in his home in New York on April 12, 2018. NASA?s top climate scientist in 1988, Hansen warned the world on a record hot June day 30 years ago that global warming was here and worsening. In a scientific study that came out a couple months later, he even forecast how warm it would get, depending on emissions of heat-trapping gases. (AP Photo/Marshall Ritzel) NY951 NY951