Its an interesting topic for sure. The most current example I can think of is China and solar panel production.
Heres a good starting article:
Solar Energy Firms Leave Waste Behind in China - washingtonpost.com
So China is now invading the solar panel market, producing a product at greatly reduced cost. But if your "green host" purchaced panels from this base, they not only contributed to pollution elsewhere, they actually increased the pollution factor more, when 'greener' methods exist.
