Designers including Es Devlin, Superflux and Maya Lin have planted forests full of trees in major cities to raise awareness of climate change or to campaign for sustainability goals.

For Forest in Klagenfurt, Austria, by Klaus Littmann
Swiss art curator Klaus Littmann planted 300 trees as a replica forest inside a football stadium in Austria in what he calls a "memorial" to the environment in the age of the anthropocene.
"For Forest is very timely as it coincides with growing global discussions and activism linked to deforestation and climate change," Littmann told Dezeen.
The forest will remain in situ until 27 October, so visitors can watch the tree's leaves turn from their summer to autumn colours. Afterwards, the trees will be replanted close to the stadium as a permanent urban forest. Find out more about For Forest ?

Ghost Forest in New York, USA, by Maya Lin
Artist and designer Lin transported 49 dead Atlantic white cedar trees into the middle of a park in Midtown Manhattan. The trees were felled and cleared from the New Jersey Pine Barrens.
"They had died off due to extreme weather events related to climate change: wind events, fire, sea-level rise, saltwater infiltration and bad forestry practices," said the artist.
Ghost Forest will remain in Madison Square Park for six months, with the dead cedar trees growing paler and more ghostly as the living trees around them change colour with the seasons.
Find out more about Ghost Forest ?...