As horticulturists have been quick to point out, however, he and his team will need to do some serious thinking on securing funding for street-tree maintenance if this aspect of his draft adaptation plan isn't to whither on the vine. And he'll be needing our industry to advise on how best to "green up" the city to protect against climate-change impacts.
Fortunately for Johnson, this past year has seen the emergence of an extraordinary body of research and initiatives in this area from the horticulture profession, which knows best how to make the vision of a fully functioning city, whatever the weather, a reality. Take for instance the launch of the Urban Canopy Initiative at July's excellent trees and climate-change conference, organised by tree consultancy TEP. The initiative, which takes as its aim the reversal of urban deforestation, is already bearing fruit - with one major council planning to incorporate the initiative into its green-space strategy.
The mayor should also be talking to the likes of Keith Sacre of Bartram Trees, whose detailed analysis of planting in London shows large trees being replaced with smaller genera offering a much-reduced canopy.
There are many more examples. But the mayor's team might like to finish with this summer's ground-breaking study into the economic value of parks conducted by researchers in Philadelphia. It has earned that city's mayor heaps of good publicity for following up with a commitment to put serious cash behind green-space maintenance.
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