Since the expansion is a paid add-on, here are the official ways to acquire it:
: Keep an eye out for frequent sales on the EA and Steam stores, where expansion packs are often discounted by 25% to 50%. the-sims-4-eco-lifestyle-download-free
: A new residential world with three distinct neighborhoods, each starting with a different eco-footprint status. A Note on "Free" Downloads Since the expansion is a paid add-on, here