Another group of congressmen has written to US Energy Secretary Steven Chu urging for more opportunities to export American gas in the international market.The bipartisan letter has been signed by 16 members of Congress.“Natural gas is a great source of energy and something we are lucky to have a lot of in the US,” said Congressman Cory Gardner.“Unfortunately, the DoE (Department of Energy) approval process for exporting natural gas to overseas customers has become marred by unnecessary roadblocks, and we are asking Secretary Chu to lift the red tape.”The