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Property developers are adding rooftop gardens to office blocks to —improveimprovesimprovingimproved both air quality and employee morale. Plants on the roof help to —absorbabsorbsabsorbingabsorbed rainwater runoff and insulate the building below, cutting heating costs in winter. Staff say the green space gives them somewhere quiet to —eateatseatingate lunch, and several firms now —organiseorganisesorganisingorganised weekly gardening sessions as a wellbeing perk.