Local manufacture is the first step. Ultimately, the question for human survival is whether we put more into our place than we take from it. Otherwise, local anthropocentric extraction is just slower than global anthropocentric extraction.
Sharks are just the guys (usually) who profit from accelerating the extraction process.
Nobody who makes a profit will tell you not to buy stuff, even (especially) if you don't need it.
Anyone who has tried to sell vegetables at a large farmers' market can tell you that people are exponentially more willing to spend money on stuff they don't need than on the things they do need.