Elon Musk's status as the world's wealthiest person is in no danger of changing. But since mid-December, the tech titan's net worth has declined by more than $100 billion, or approximately 25%, as a sell-off in shares of Tesla,

About 10 years ago, Tom Blackburn became one of the first 100,000 people to buy a Tesla Model S. The purchase was part of a broader effort to adopt a more environmentally conscious lifestyle, which also included installing solar panels on his Virginia home.