I'm sure that's the case in most industries. They know what they buy, sell, who they outsource to etc. Lenovo and Apple know where their laptops were made, which bits and what raw materials or suppliers they used.
All we need is to derive the impact from each step, and some helpful way to present it. For presentation we know approaches that work. So it's really just requiring the carbon/impact accounting - and penalties for fraud. :)
Then we can decide if we're better off, environmentally, buying a Thinkpad, a Macbook, or a Mac Mini with LG monitor. Whether to pass on those out of season lettuces, or should really be concerned about something making more impact. All we can do right now is guess for just about everything.
