Local weathercasters have become one of the primary conduits for news on global warming. One nonprofit helped push the change.

Steve LaPointe has been a television weatherman for nearly three decades, and for most of his career, he didn’t focus much on global warming. He was skeptical about the science behind it, particularly the notion that human behavior was heating the planet.

But the issue wouldn’t go away. So LaPointe began to do “a lot of homework,” he said, reading research papers and consulting fellow meteorologists, who connected him with a nonprofit, Climate Central, that spreads information on climate change.

LaPointe increasingly came to realize he was wrong — that the evidence that greenhouse gases are warming the Earth is “irrefutable.” Now, LaPointe routinely reports on the effects of climate change — from the escalated growth of poison ivy to a jump in the number of high-pollen days — alongside his usual seven-day nightly forecasts on CBS affiliate WRGB in Albany, New York.