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Approximately 10,000 ha are under cultivation for Dutch horticulture under glass and it currently consumes more than 4 billion m 3 of natural gas per year. By the year 2000 a 50% reduction in gas consumption compared to the 1980 level is hoped to be reached through improved energy efficiency. Consumption was reduced to about 62% of the 1980 level by 1994. However, there was failure concerning...