A government worker's message for Elon Musk
CBSN
Coal mining has always been dangerous, one of the deadliest professions in the nation. In the 20th century, more than 100,000 workers died in the U.S. mining industry.
Christopher Mark experienced that risk first-hand. "I started the mines in 1976; it was almost 50 years ago," he said. "And I worked underground altogether for about two years. And I can tell you, I was almost killed a couple times."
Mine safety has been Mark's life's work. In his 20s, he left the coalfields to earn a Ph.D., then returned as an engineer for the federal government. His efforts have helped save countless lives underground. "It was still maybe a coal miner every week that was being killed in a rock fall," he said. "In 2016, we had our first year with zero, a really tremendous accomplishment."

The peace and tranquility of Muir Woods, just north of San Francisco – home to 500+ acres of old-growth redwoods – make it just about the last place you'd expect to find a fight brewing. "The fact that they're taking down whole groups of signs about climate change and our nation's history is disappointing, and embarrassing," said retired U.S. Park Ranger Lucy Scott In:

We share our planet with maybe 10 million species of plants, animals, birds, fish, fungi and bugs. And to help identify them, millions of people are using a free phone app. "Currently we have about six million people using the platform every month," said Scott Loarie, the executive director of iNaturalist, a nonprofit.











