In March last year, you may remember, Plane Stupid activists occupied the runway at Aberdeen airport. They took direct action (including erecting a makeshift golf course) to protest about expansion plans for the airport, which are being pushed through to serve an enormous golf course and hotel complex planned by US entrepreneur and The Apprentice star Donald Trump.
Now nine of them (including a call centre manager, a chef, a father, an artist and a university lecturer) find themselves on trial. But the Climate 9, as they've become known, plan to use the case to challenge Scottish climate policy. Currently all 17 Scottish airports are aiming to expand; if this happened it would triple the nation's aviation emissions, which already make up 11% of the UK total.