FRANKFURT (Reuters) - The European Central Bank plans to ask lenders to assess and disclose their climate-related risks, it said on Wednesday, a step that may force banks to take greater responsibility for financing environmentally damaging sectors. ECB President Christine Lagarde has said the bank will do its part in the fight against climate change, which she called "mission critical", including through its supervisory arm, which oversees the 19-country currency union's biggest lenders.In a..