So, big shareholder tells coal companies to change their ways, or what? Blackrock will sell its shares? Hard to believe. And even if it sells its shares, s

So, big shareholder tells coal companies to change their ways, or what? Blackrock will sell its shares? Hard to believe. And even if it sells its shares, someone has to buy them -- perhaps at a slightly lower price if they dump a lot at once. But what change has it produced?