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myne t1_j74lmat wrote

Reply to comment by sweetplantveal in Planting more trees could axe summer deaths by a third. Modelling of 93 European cities finds that increasing tree cover up to 30% can help lower the temperature of urban environments by an average of 0.4°C and prevent one in three heat deaths as a result. by MistWeaver80

I'm going to suggest vines.

Deciduous vines can be trained, pruned and intertwined to cover a roadway entirely with a lower footprint than a tree. Presumably there are vines that can reach at least 6m high.

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