First of all, it is still not perfect. The lack of eco-friendly businesses and industries still stands almost two years after release and various DLC released afterwards. But, a lot of buildings have been revamped and made more eco-friendly, solving a lot of pollution in the game. Overall it really can impact the livelihoods of citizens, as well as expenditure in the game, pollution may go down quite a bit, especially when combined with later DLC. Worth it.