To answer your question on other industries that might be have incorporated such social conscious business model, I find WarbyParker (www.warbyparker.com) doing an extraordinary job. Their business idea also started with a problem similar to TOMSs. The company was a startup, by a group of students, one of who lost a pair of glasses on a backpacking trip. The extremely high cost of replacement of the prescription glasses resulted in the student squinting and going without glasses for the next six months.
A little research by this group of students revealed that the eyewear industry is dominated by a handful of companies that keep prices high while reaping