I visited some friends yesterday, there was some sort of " save the planet festival" in the park by them, So we went for a walk around.
The usual shows about how us humans are destroying the planet, powered by diesel generators that do not have the filter systems of vehicles and were choking to walk past.
The finale was an evening light show, powered by those diesel generators and a load of heavy, rusty steel structures, that must cost a fortune to move, lit up with a couple of hundred 19k propane gas bottles, followed by a firework display.
All taxpayer funded of course, and inside the new ULEZ, You really could not make it up.