Bill Gates has a terse response to criticism that the high-tech solutions he advocates for world hunger are too expensive or bad for the environment: Countries can embrace modern seed technology and genetic modification or their citizens will starve.
When he was in high school in the 1960s, people worried there wouldn't be enough food to feed the world, Gates recalled in his fourth annual letter, which was published online Tuesday. But the "green revolution," which transformed agriculture with high-yield crop varieties and other innovations, warded off famine.
