You ain’t gonna need it. You know our natural world is burning and climate disaster is upon us. We need system change - not climate change. We as agilists4theplanet are in the perfect position to help the system change happen, because what we do in IT product development matters; rather a lot to be honest. Let's uncover better ways to develop IT products in a more sustainable way. This talk will take you on a crash course of thinking like a 21st century economist (it will be all about doughnuts), principles of circular design and what you need to know about the concept of degrowth. And then the talk will tie this knowledge to our day-to-day-work in product development: how could you start using these ideas in your work to contribute to building a more sustainable future? I will tell you (from my own experience) what happened when we started applying circular design principles in IT product development (we ended up with modularity and microservices). If one starts applying the "Sharing principle" your product vision will change (for us it changed into "something as a service") and your product goal and OKRs will change too - we moved away from the goal "endless growth in number of customers". This talk will leave you with practical tips on how to amplify your sustainability actions in your entire product development chain, like Product design principles for circularity and like Sharing principles for less (economic) growth. This talk will also leave you with a bigger - or reaffirmed - love for Agile Principle nr 10. The planet needs more simplicity – you ain’t gonna need it! (and no, this talk is not just about carbon emissions because "net zero" will not be enough to get us through)