At 72, he said, he feels a moral obligation to step up his activism in his remaining years.
"If we burn even a substantial fraction of the fossil fuels, we guarantee there's going to be unstoppable changes" in the climate of the earth, he said. "We're going to leave a situation for young people and future generations that they may have no way to deal with."
Eruptive events on the sun can be wildly different. Some come just with a solar flare, some with an additional ejection of solar material called a coronal mass ejection (CME), and some with complex moving structures in association with changes in magnetic field lines that loop up into the sun's atmosphere, the corona.