There is no practical way. We might be able to in 50 years, but it would exact a huge toll in terms of resources, money and time. Is that the best place to spend those resources? How many tons of coal should we burn to accomplish that? How many tons of launcher should we discard? Again, there's no comparison. Learning how to run a Sabatier process to recycle CO2, learning how to scavenge more air from an airlock, learning how to make more efficient stationkeeping engines gives us exactly zero insight into our problems here on Earth. I am all for research on the ISS. It will help our future space endeavors. It will not solve any environmental problems here on Earth. Indeed, if you want to "go green" with the ISS - switch to methalox engines in the resupply rockets as soon as possible. Not that that will help us learn to save our own environment, it will just pollute a bit less while we are doing unrelated research.