BlackRock takes tougher stance on climate after activist heat

LONDON (Reuters) - BlackRock Chief Executive Larry Fink has warned company boards to step up efforts to tackle climate change, marking a significant shift in the public stance of the world's biggest investment manager amid mounting concerns about global warming.In his annual letter to CEOs, Fink said they must act or face increased wrath from investors concerned about how unsustainable business practices might curb their future wealth.He said BlackRock would exit investments that presented..