Earlier quoted context omitted.
Hold the corps to account, vote with your wallet, demand that they reinvest profits in education and betterment and development of these geographic areas.
So where do you start? Your phone? Computer? Clothes? Car? Food?
Clothes is a nice and easy one to begin with choosing an alternative for because it's a much more simplistic product with a more easily traced supply chain. Phones, computers and cars are something we'll likely struggle with for a long time.
For anything else, the public will likely need to demand change as I doubt a superior or equal alternative will emerge. With that said, products like the FairPhone are very interesting, though I haven't used one.
Food is something that'll largely hinge on your geographic area and availability of produce that makes sense.