"Explain to me what good it has done"
Well we've had a nice pink boat in the middle of London, which would have been good, but I gather it was plastic 
Emma's planted some more trees to ameliorate her "emergency air travel"
Robin Boardman-Whatshisface a very, very important Extinction Rebellion spokesperson has some gritty "getting down and dirty on the pavement protest" pics to upload to his Instagram page along with his absolutely "emergency air travel" ones to the Maldives
and taking on the piste skiing holidays.
Lily Allen wasn't there, that's really good cos although Emma's ever so slightly batshit she does at least have some talent neither does she keep displaying very long green/blue nails when she wiping her eyes after having a meaningful grizzle on behalf of the nation. In fact Emma has remained pretty cheerful throughout, but maybe that's down to the pink plastic boat, or just getting out of the US, a miserable donut infested land mass as opposed to a sad, grey cake filled island. Anyway speculation who knows!
Lots of police have had their holiday leave cancelled which is kind of awful.............but the upside of that is, they might not be flying off anywhere on "non emergency air travel" like taking the kids on their annual holiday, I mean it's not as if they are Robin Boardman-Whathisface, or even Emma, or a Climate Control Lawyer...and I suspect, unlike Emma once they get back to the UK, they wouldn't plant a single tree 
Finding out there are Climate Control Lawyers Wow! mega impressive! Their air travel must be in the "well emergency" bracket and I bet they plant loads of trees when they get back.
Finding out some of the protestors use "once only coffee cups and plastic bottles"....................ummmm! as my grandchildren might say 
Some young protestors unfurled a banner at tunnels leading to Terminal 2 and 3 about unnecessary air travel, but were moved on allegedly, so they went back into London to unfurl it to Emma and Robin-Boardman-Whathisface when happily there was a group "Eureka moment" and it was unanimously decided that perhaps the banner (ethically sourced) of course, could be used by those protestors who didn't bring enough in the way of loo rolls.
My personal piece de resistance would be those that super glued themselves to Jeremy Corbyn's gaffe, I keep wondering if they are still there and Jezza's been out to spoon feed them cold baked beans (Tescos) of course.
I'll try and think of some more but thus far I'd say that's a satisfactory outcome 