This story has been updated below.
The three top U.S. tycoons on Forbes’s “Green” billionaires list have received billions of dollars in taxpayer subsidies for their clean technology companies, after they spent hundreds of thousands of dollars for political campaigns and lobbying.
Two of the moguls, Elon Musk and Vinod Khosla (in photo), are technology pioneers based in California with net worths of $2 billion and $1.3 billion, respectively. The third, Christy Walton, is the widow of the late John Walton who was an heir to the Walmart fortune. Forbes says she is “the world’s richest woman” is worth $24.8 billion.
Significant percentages of Musk’s and Khosla’s value are derived from “eco-friendly” holdings. Musk’s main green investments are in Tesla Motors, an electric automaker, and SolarCity. Among Khosla’s clean-tech assets are KiOR and Gevo, both biofuels companies, and Calera Corporation, a company that uses captured carbon …