Even the single most offending business can claim only a small percent of the total damage.
When industries are cartelized, that's less true. There's a real knock-on effect between firms, such that a procedure change in a single heavyweight forces others to follow suite or divide off into niches. Classic example of this was Exxon's adoption of Oracle database suite. Once they got on board, all their clients and partners were dragged along for the ride.
Another great example is the provisions of the Inflation Reduction Act that throw billions into grid overhauls that prioritize green energy. Wind/Solar dipping under coal has set off a massive construction frenzy, particularly in Sunbelt states like Arizona and Texas. You can claim no single coal plant is responsible for climate change. But when a MWh of power from wind gets under coal, it doesn't matter, because every coal plant sees a reduction in business and every wind farm sees a surge in consumption.
All that to say, these aren't individual problems. They are systemic. And they can only be solved systemically.
I’ve been talking about how we are all responsible
That's simply not true. If everyone on my block were to throw themselves off their roofs tomorrow and reduce consumption to a flat zero, climate change would continue apace. If the senior staff at these 60 corporate plants did the same, and there was suddenly a vacuum of leadership/lobbying going into the opposition to climate change reforms, the story would be entirely different.
We are not all responsible. Not in a privatized for-profit corporate hierarchy of an economy.