I can also recommend the Planet Money podcast which covered tshirts. It changed my mind about the whole globalization and child labour story. The textile industry is the first step towards industrialization, and despite the abuses it's a net positive for humanity. More so when you consider the systemic pressure of the charities which work for better conditions.
The only counter argument is global warming: development means more energy usage, which means more warming. Certain groups know this, and would prefer that 80% of the world's population live a Victorian lifestyle so we can keep enjoying ours.
It's clear to me that if our generation can solve the energy problem then the driving factors behind most of the human-world problems go away.
This episode goes into detail iirc: http://www.npr.org/sections/money/2013/12/03/247360855/two-s...
https://www.gapminder.org/videos/the-joy-of-stats/
Or here is the direct link on Vimeo