Reuters: Global institutional investors holding more than $6 trillion in assets pushed policymakers Tuesday to quickly hash out a binding agreement to cut greenhouse gas emissions and promote clean technology. More than 130 big investors, including London Pensions Fund Authority, want countries to agree to reduce the climate- warming emissions by 50 percent to 80 percent by 2050. Those numbers are in line with global warming policy favored by U.S. President-elect Barack Obama, who …