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They could've mentioned any of several "depave" projects in the UK and since they mention London, this guidance is decent and could do with being more widely known, and there's a huge street-greening project in Sheffield.
Perhaps they mean a more specific critique that a 'movement' is needed (rather than lots of individual community projects and some council-led), obviously I agree generally much more awareness of the issue is needed. It just comes across a bit "the US has a thing we need" rather than highlighting some of the good work being done here.
https://www.london.gov.uk/sites/default/files/grey_to_green_guide.pdf
Just observations: the trend for off road parking has added to the additional strain being put on to Victorian drainage. The amount of soil / grass/ planted areas that has disappeared completely in some urban landscapes. The added hard standing areas that flow towards the drains rather than standing must be a huge additional add to capacity consttaints. Sometimes we sow and get what we deserve.