I think you are being naive. What do you think would happen in a large, profitable corporation if an engineer suddenly said "I have discovered one of our products appears to be bad for the environment?" (a) The corporation thanks the engineer, goes public with the news, and withdraws the product, or (b) the corporation gets the engineer to sign a whole bunch of legally binding documents to shut him up and then quietly get rid of him?
When they get big enough, corporations are not shaped by their employees, their employees are shaped by the corporation. Engineers who are concerned are sidelined and/or removed, and engineers who dont care and/or are in denial are successful.
For every example you can give of government/corporations working together I can give you a dozen counter examples. That is the nature of the free market .. a corporation wants to grow and be profitable without limit. It's darwinian natural selection. it is therefore inevitable that any regulatory body, governmental or otherwise, is either going to be in conflict with the corporations it governs, or corrupted and conspiring with those corporations. I'm not judging this, its actually a very efficient system in the darwinian sense, but imagining that corporations are all benevolent and caring is naive .. in the long term those that are caring are either eaten by those that are callous or gradually evolve to be uncaring. Look at Google for example, a company whose motto used to be "do no evil" and is now a huge bloated business based around extracting as much personal data as possible on every single person on the planet (and fights any legislation that restricts its ability to do that).