While many people had the environment on their minds last month for at least 24 hours (see you next year, Earth Day), some of the biggest QSRs and food service companies—including McDonald’s, Baskin Robbins, Dunkin’, and Yum! Brands (parent company of KFC, Taco Bell, and Pizza Hut)—were busy drafting an open letter asking the European Commission to pause the rollout of a new set of packaging regulations proposed last November called Packaging and Packaging Waste Regulation (PPWR).

Under a newly formed alliance, the group of companies called Together for Sustainable Packaging addresses new rules that would prevent chains like Baskin Robbins and McDonald’s from using single-use packaging for food served in-store.

Together for Sustainable Packaging cites concerns over the additional water required to wash reusable packaging, increased greenhouse gas emissions (GHG), hygiene, and safety concerns. The alliance’s letter notes industry-funded studies conducted by Ramboll, Kearney, and another industry-funded group called the European Paper Packaging Alliance, which has led to criticism over the figures mentioned and conclusions reached in this open letter.