Green and blue infrastructure refers to the spatial structure of natural and semi-natural areas (including greenery and water bodies), but also other environmental features which enable citizens to benefit from its multiple services. With respect to climate change adaptation measures, employment of green infrastructure include: green roofs - increasing the energy efficiency of buildings, green walls, and green public spaces as well as development of blue infrastructure: increasing water retention, permeability of the terrain in the cities, lakes and rivers in the city.
Source: http://ec.europa.eu/environment/nature/ecosystems/index_en.htm
http://www.grabs-eu.org/membersArea/files/Database_Final_no_hyperlinks.pdf