President Barack Obama pushed drilling for gas in shale rock and support for cleaner energy sources to boost the economy in his final State of the Union address before facing U.S. voters in November. He also pledged more oil drilling. “We have a supply of natural gas that can last America nearly 100 years, and my administration will take every possible action to safely develop this energy,” Obama said. --Jim Snyder and Katarzyna Klimasinska, Bloomberg, 25 January 2012