PETER KALMUS: Well, so, let’s be really clear, right? So, as you said earlier, about roughly 80% of global heating is caused by burning fossil fuels.

Peter Kalmus, the NASA scientist, has been arrested numerous times for his climate change activism. Coming up next, consumer advocate, former presidential candidate Ralph Nader on the life and ...

PETER KALMUS: Yeah, they basically block a lot of the light from the sun so that you don’t go blind and you don’t hurt your eyes. So, please don’t look directly at the sun.

Peter Kalmus of Chapel Hill studies biodiversity and ecological forecasting for NASA. Rose Abramoff of Knoxville, Tennessee, researches how climate change affects ecosystems.

Peter Kalmus sits with his son Zane on a porch swing at the Possibility Alliance. (Evan Bush / NBC News) Crickets trilled. Roosters crowed. A tear dripped down Ethan’s cheek.

Climate scientist Peter Kalmus visits a fossil-fuel-free homestead in Maine, looking not for solutions to climate change, but for a better way to survive it and make peace with his grief.

On April 6th, Dr. Peter Kalmus, NASA climate scientist and author, walked up to the JP Morgan Chase bank building in Los Angeles, pulled a pair of handcuffs out of a cloth bag and chained himself ...

Peter Kalmus, a climate scientist with NASA’s Jet Propulsion Laboratory, chained himself to the doors of the Wilson Air Center in Charlotte, N.C., last week as part of a protest against private ...

Peter Kalmus, a NASA climate scientist, set out to reduce his own personal carbon footprint. He reduced his use of fossil fuels over a four-year period and wrote a book about what normal people ...

Peter Kalmus The problem with the climate movement really is that it has only activated a tiny proportion of the public. Everyone on the planet is affected by Earth’s breakdown, even the rich.