book4 课后习题(2)

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It's true that greenhouses consume resources, but making the correct choices when you design, build, and run your greenhouses can make your growing operation more sustainable. Typical greenhouse operation consumes 1) ___ amounts of plastic, from the plastic film covering on many greenhouses, to the plastic packaging of soil and fertilizers. Choosing recyclable materials, both in the 2) ___ of greenhouses and in their everyday operation, is one effective way to run sustainable greenhouses. By their very nature, greenhouses are good at collecting energy from the 3) ___ sun and using it to warm or heat their 4) ___ to the appropriate temperature. Passive solar design, which doesn't use mechanical or electrical 5) ___ but simply a building's own structure to capture and store solar energy, is usually most people's choice for their greenhouses. Meanwhile, allowing for adequate control of 6) ___ when you design greenhouses minimizes the need for electric fans and other energy-consuming cooling solutions. A good greenhouse design also considers the installation of thermal-banking system, a process that uses the sun to heat water and then 7) ___ the water underground, where it can be used to heat the greenhouse in cooler weather. Though the thermal-banking project sounds a little 8) ___ due to the extra design and work it requires, it helps make the operation of the greenhouse more sustainable. The operation of a greenhouse consumes energy and uses a lot of water as well. To 9) ___ this problem, you can replace traditional lighting with more energy-efficient LED lighting, and build a rainwater collection and storage system. These methods can