The EU-funded STEPforGGR project seeks to promote a novel technology for the removal of non-CO2 greenhouse gases, utilising large-scale atmospheric photocatalysis enabled by solar up-draft towers. The project, involving world-leading institutions in the relevant subject areas of physics, chemistry, engineering and manufacturing, will jointly evaluate the feasibility of this new but entirely untested negative emission technology and build a foundation for climate policy debate and practical application, tackling climate change at the global scale. This robust network will identify bottlenecks and provide solutions to greenhouse gas removal at a climatically relevant scale.