> In the Netherlands, which is the world's largest producer of glasshouse grown crops, some 10,500 hectares of greenhouses used 120 petajoules (PJ) of natural g

> In the Netherlands, which is the world's largest producer of glasshouse grown crops, some 10,500 hectares of greenhouses used 120 petajoules (PJ) of natural gas in 2013 On a recent tour of hydroponic growers in Almeria, Spain, I was told that province alone had 30,000 hectares in commercial greenhouses.