Madrid is drawing up lans to plant gardens on the rooftop of the city's buses and bus stops.
The authorities in the Spanish capital have come up with the proposals as a novel way of tackling CO2 emissions, The Local reported.
The gardens are also intended to soak up heat, noise and pollution.
A garden on a bus rooftop will cost 2,500 Euros (£2,143.35). Those on the top of bus shelters will be rather cheaper.
The project, known as “Muévete en verde” , is one of six schemes designed to improve the city's environment. They were chosen out of 800 entries.
A pilot project will involved just two routes in Madrid - no 27 and 34 - which were used by 17 million people last year.
“Each garden will be formed of metallic meshes and sustainable materials that can withstand movement and not leak water,” said José Antonio Antona., the project manager.
The gardens will be built from metallic meshes and other sustainable materials. There will also be customised irrigation systems designed to avoid leakage.
Manuela Carmena, Madrid's left-wing mayor elected in May 2015, has endorsed the plan.
Adapted from an online article published in The Telepgraph in December 2016