Reuters: Indian conglomerate Adani Enterprise Ltd may walk away from its proposal to build one of the world's biggest coal mines in Australia, citing long delays caused by legal challenges to the project by groups concerned about the environment. Adani is battling multiple legal challenges from green groups opposed to its $10-billion Carmichael mine, rail and port project. The Australian on Saturday reported that the company's founder and chairman, Gautam Adani had told the newspaper the company may abandon...