After hearing about the conservationist career in Island Living I was quite excited about it until I learned the effects of the island being pristine would be permanent rather than happening again if our Sims didn't do anything to keep the eco system from reverting back to it's previous state. My understanding of the environmental changes in Eco Lifestyle is the world will stay clean only if our Sims continue to do the work that will keep the world from becoming polluted again. Same concept is in both packs, but the outcomes are quite different. Yes, it has taken three years to flesh out the concept of an eco lifestyle, and we have seen bits and pieces of it scattered across several packs and updates. Frankly, once Island Living was released, I assumed the teams were finished with the concept and would move on. But with Eco Lifestyle, the teams have added another layer to the gameplay that was introduced in IL, making it feel more real which gives Eco Lifestyle a lot more playability and options for the players. We will be able to choose how much or how little we want the worlds to change. This is especially interesting when the pollution can be added to all the worlds except Strangerville and the destination/vacation worlds. For the first time in the Sims franchise, our Sims and what they do, will have an impact on their entire world rather than only the environment inside their homes. When I bought IL I believed this would be how the conservationism would be handled, but it wasn't. And my disappointment in that pack ran deep. I was very vocal about that sad fact. But the information I am seeing now from the gurus seems to be pointing in the right direction, and is everything I had hoped to see in Island Living.