From the air we breathe to the water we drink and the land we grow our food on, our ecological footprint and means to minimise it are more in the focus than ever. Innovative technological solutions, including space-based applications, can help to prevent pollution and reduce its negative impacts: from agriculture to transport. To mark the European Green Week 2021, which runs from 31 May to 4 June, we look at some of the contributions that space is making to a greener future.