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Milan's 'Bosco verticale' project is currently under construction and will consist of two residential towers supporting ornamental woodland and shrubbery.
New York's Highline converted railway line has become a much-loved green space for walking and relaxing right in the heart of the city. It was inspired by an earlier project in Paris, the 'Promenade Plantée'.
In London, an old building has found a new use as a vertical garden.
Verge gardens get a write up in Australia, these use small urban spaces and are managed by the local people.
There's lots of scope for individual and group action. Contact your local town council. Form a local community project. There are some good ideas in Groundwork's toolbox document. On the whole group action may be best, you can plan together, work on the planting and maintenance together, enjoy the space together, eat together, become a real community in the process of creating a cared-for green space in your environment. What could be better?