Vancouver joining push for rooftop oases among cityscape canyons

New convention centre to boast a meadow on top -- the largest green roof in country
When the Vancouver convention centre spreads its sails in 2008 with a $500-million expansion, it will be sporting a 2.4-hectare roof alive with flowers and grasses. Destined to be the largest green roof in Canada, it will cover the equivalent of four city blocks.
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