While Europeans can track and understand their personal transport emissions, they have little to no information regarding the impact of their online shopping deliveries and returns. This is due to a mix of challenges, including the complexity of calculating emissions across the e-commerce supply chain, and the limited regulatory levers public authorities have to influence greener practices. To overcome these challenges, GreenTurn brings together a diverse range of e-commerce stakeholders to co-create zero-emission logistics solutions, provide sound and transparent information on e-commerce footprints, and enable more sustainable delivery and return choices. The consortium comprises 14 partners from 7 different countries, and is further complemented by its Stakeholder Advisory Board, activated during key project moments. GreenTurn uses design thinking approaches to develop solutions which bridge between behavioural interventions (including incentives, nudges and gamification) and delivery and return options (such as time windows, in-store pick-ups and returnable packaging, among others). To test solutions, GreenTurn implements 5 complementary pilots involving 1 LSP, 1 marketplace provider and 1 retailer - as partners, and >8 LSPs, >3 marketplaces, >7 retailers - as stakeholders. Through the involvement of significant and diverse companies, the project has potential to reach and raise awareness among >30M e-commerce consumers from 5 countries: Poland, Spain, France, Greece and Austria. Advanced logistics systems allow the five pilots to offer, on average, 82% of delivery and return options as zero-emission. Besides, the GreenTurn pilots will touch upon social sustainability aspects too, for both customers (e.g., physical and digital accessibility), and e-commerce logistics employees (e.g., work conditions, market reintegration, etc.) Together with its public authorities, GreenTurn will translate results into policies that can secure uptake and long-term impact.