Standing in the middle of the cloud forest in my home country of Costa Rica as a child I made the choice to dedicate my life to protecting the environment. Back then, the first image that came to mind when thinking about biodiversity conservation was definitely not that of a flourishing city. Fast forward 20 years and you’ll find the same environmentalist sitting in front of a computer in an office working on the challenges cities face as a result of climate change. What is a biologist doing working on cities? Well, I’m basically doing what I promised myself to do as a child… just from a different angle and in an apparently less exotic setting.