BlackRock vows tougher stance on climate after activist heat

LONDON/BOSTON (Reuters) - BlackRock Chief Executive Larry Fink warned company boards to step up efforts to tackle climate change, a significant shift by the world's biggest investment manager, which has faced mounting concerns about its role as a major fossil fuel investor.In his annual letter to CEOs posted on the company's website on Tuesday, Fink forecast a "fundamental reshaping of finance" and said companies must act or face anger from investors over how unsustainable business practices..