Moving manufacturing and infrastructure from "dirty" to "green" is a transition process. It's infeasible to modify the entire supply chain to be non-renewable in one shot.
The entire world's economy is incredibly intertwined. The entire manufacturing stack won't be purely renewable until the entire world is running on renewable energy.
In today's world, you have to make an effort to not fart with a bad carbon footprint. Most of your personal emissions will be ingested air. (Not methane, as most think.) However, the fertilizers and pesticides in the food you ate to make you fart, plus the heat to cook the food, and the industrial input it took to make the cooking implements and the kitchen the food was cooked in -- all of these have a carbon footprint.
It's precisely as you say. We are in transition. It's naive to point out that anything "green" still has a carbon footprint. I need to find a definitive article that makes the case for this idea so I can link to it every time I see the naive argument.
http://www.aljazeera.com/news/africa/2014/08/kenya-lead-pois...