LOS ANGELES — Alex Honnold knows a thing about passion and challenges. Since his legendary ropeless ascent up Yosemite’s El Capitan in “ Free Solo,” the professional rock climber has taken on a host of projects around environmental conservation and battling climate change.

On Tuesday, Rolex released the first episode of the fifth season of the Planet Visionaries podcast in which Honnold, who hosts the show, gives a platform for scientists and the world’s innovators to be heard.

The podcast is one of many projects Honnold is involved in amid the growing threats to public lands in the U.S., denial of climate change and questioning of science.

“I interview guests who are very passionate about what they do and very good at what they do, and I typically come out of the interviews feeling all

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