It sounded like a good idea back in 2000. Two decades after the Cold War ended, the United States and Russia each agreed to dispose of 34 metric tons of weapons-grade plutonium -- enough for about 20,000 warheads -- by combining most of it with uranium to create mixed-oxide fuel for commercial nuclear reactors.
Today, the Earth got a little hotter, and a little more crowded. California Gov. Jerry Brown signed a package of bills to promote more CA electric cars, while New York Mayor Bill de Blasio unveiled plans for $1 billion in energy retrofits for municipal buildings and pressuring landlords into reducing energy use.