Setting an example is a minor point - but that second bit "making technologies cheaper" that's where you'll really find compelling reasons for non-western natio

Setting an example is a minor point - but that second bit "making technologies cheaper" that's where you'll really find compelling reasons for non-western nations to switch. If the world is producing so many tons to solar cells so that western nations can convert over and the demand starts to slow as their conversion processes near their end then those production lines can find new customers.