According to this article they were and it is only due to the Republican controlled states using the courts to enforce anti-trust laws that has stopped them this time. It's a complex web, but just plausible that these corporate giants would work together, like a giant example of group-think. Of course they believed they were doing good by saving the planet.
Read the details here and see what you think:
It’s a win: Bankers are backing away from the Monster Banking Climate Cartel « JoNova