Read the text again and for each gap (1-7) choose from the sentences A-H the one which best fits each gap. There is one extra sentence. A The idea isn't without its problems though. B However, that doesn't mean we won't be able to do it soon. C These are long gone. D We are already using too much of our farmland. E "With about 160 of these buildings, you could be feeding all of New York," he says. F The idea is actually very simple. G They will be powered by solar and wind energy. H On one floor there will be lettuce, on the next carrots, and so on.
