these 100 corporations probably produce 71% of the things that we buy every day, so I don't really see the point.
and these are fossil fuel companies.
But your point is valid, in the sense that the consequence is "don't buy their products"
Which broadly means: don't drive, don't fly, don't buy plastics or synthetics; make sure your electricity and home heating is not from fossil fuels.
For people who care about, support, or build Free, Libre, and Open Source Software (FLOSS).