When I think of the mega corporations I'm reminded of Popes. Usually they just get on your nerves but, every now and then, you might get a Pope Francis. Every now and then something progressive manages to leak out of the corporate boardrooms such as this video produced by the World Business Council for Sustainable Development entitled the "Pitch for Nature.".
Part of the movement behind a transition to "steady state" economics is to accept economics as a subset of the environment. The economy cannot grow beyond the limits of the environment, our one and only biosphere. The environment belongs to mankind, not to corporations. In a steady state economy, natural capital is valued and priced. Corporations pay the public for what they have been taking freely that belongs to the public. Yes they may pass along part or even all of that cost to the consumer but that doesn't matter because they've already paid that amount into the public purse and, having done so, they have a powerful financial disincentive to waste resources and to pollute them.