Voice of America: As countries around the world mark World Environment Day Friday, members of the U.S. Congress are preparing to debate new legislation aimed to slow global warming. From Washington, VOA’s Kate Woodsome examines how actions in the United States may influence the international debate on combating climate change. Blocks from the U.S. Capitol building, John Mulqueen navigates a bicycle rickshaw through the traffic on a rainy Washington street. Mulqueen is one of many drivers in a …