Green Production ROI for Sub-$100K Budgets: Justifying LED and Waste Reduction?

For productions under $100K, justifying the initial costs of green practices comes down to immediate, tangible ROI primarily through reduced operational expenses, especially with LED lighting and robust waste reduction programs. On a shoot where I was operating Steadicam with an ALEXA Mini, I saw firsthand how quickly the switch from older HMIs to modern LED fixtures like the LS 1200d Pro and LS 300x slashed the generator fuel consumption. We were burning significantly less diesel, which is a direct cost saving that adds up over even a few days of principal photography. Beyond energy, integrating simple reusable water bottles and cutlery eliminated daily catering waste, reducing dumpster fees and the sheer volume of single-use plastics we had to manage. These small steps compound to substantial savings, making the 'initial investment' more of a reallocation of funds from disposable practices to sustainable ones. The Block Reel DAO guide, "Sustainable Filmmaking: The Complete Guide to Green Production Practices" (https://blockreeldao.com/blog/sustainable-filmmaking-the-complete-guide-to-green-production-practices), really hammers home how early integration of a 'Green Producer' can drive these efficiencies from day one. What other specific areas have smaller productions found yield quick returns on sustainable investments?