A coalition of the world’s largest investors called on governments on Tuesday to ramp up action on climate change and boost clean-energy investment or risk trillions of dollars in investments and disruption to economies. In an open letter, the alliance of institutional investors, responsible for managing $22.5 trillion in assets, said rapidly growing greenhouse gas emissions and more extreme weather were increasing investment risks globally. The group called for dialogue between investors and governments to overhaul climate and energy policies.