What do you mean by "held proportionally responsible" --what do you want to happen? Should they dismantle their oil companies? Go to jail? Get a humongous fine?
Knowing who the culprits are and making them pay for what they did are two vastly different things. Tooting about that definitely doesn't contribute to anything.
The problem is systemic, the solution must be systematic, so top-down, not bottom-up. Politics, flawed and boring as it is, is the only force that can stop this.