I've left but a light carbon footprint on the world today - walking over first thing to the Wales Millennium Centre to chair a WWF Cymru debate on their concept of a One Planet Wales, in other words a Wales that uses no more than its fair share of the world's resources. I got up so early I didn't even boil a kettle, so there.
But proof positive this morning that our one world isn't just wasteful; it's also potty.
The Ministry of Defence has a reward system for companies who work efficiently and sustainably. Government systems like that have a tendency to be ever so slightly unbending. Once they're in place, you stick to them. So they lately awarded a prize for low carbon impact to a company with a contract to make anti-aircraft missiles.
Well done. The world must be a better place for having companies in it that kill people sustainably.
Better go and boil a kettle I think.