regarding his environmental legacy I find it impossible to pick apart. This article is linked from those letters:
It mentions ULEZ expansion, LTNs and a carbon neutral London in 9 years.
I thought the ULEZ expansion was forced onto him by the government in the run up to the election
to make him unpopular, similar to the increases in ticket prices for public transport in exchange for a bail out.
LTNs have been around for decades and the recent ones seem to get dismantled left and right and I can't tell how much power over them comes from the Mayor or the Councils.
Similar to the Street Space initiative that just has enriched manufacturers of plastic street clutter and in some places like the Greenwich Naval College was used to block public access to open spaces during lockdown. Also not clear how much there is Government, Mayor or Councils.
Small thing but big one for me is the removal of cycling access on Waterloo Bridge.
Carbon neural in 9 years is just lol. Unless of course it consists of buying some imaginary emission rights or similar bullshit.