Reuters: Investors managing more than $2.3 trillion urged the government on Tuesday to enact strict laws to cut greenhouse gas emissions, saying lax regulation could hurt the competitiveness of U.S. companies. The group of some 50 investors, including the world’s biggest listed hedge fund firm, Man Group Plc and influential venture capitalist John Doerr, want U.S. lawmakers to pass laws to reduce climate-warming emissions by at least 60 to 90 percent by 2050. Legislation that promotes …