Edible rooftopsWith the cost of producing and distributing food becoming ____ expensive, consumers are having to pay far higher prices for their food. In many cities around the world this has led to a new ____ to produce food which is grown ____. The idea is to cut the distances food has to travel and to have reliable sources of fresh vegetables available for people living in big cities. The main ____ with growing vegetables in a city is that land is very expensive, so using space which is currently being wasted, such as rooftops, is seen as one ____. There are hundreds of unused places that could play an important role in creating a more sustainable environment, although clearly it would be ____ for rooftop gardens to provide all the vegetables needed for a whole city, especially as rooftops are not the ____ places to grow vegetables. There needs to be a good supply of rainwater and plants need some ____ from the wind.

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