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Polytunnels on Balhungie Farm, Angus A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape.
The terms greenhouse, glasshouse, and hothouse are often used interchangeably to refer to buildings used for cultivating plants. The specific term used depends on the material and heating system used in the building. Nowadays, greenhouses are more commonly constructed with a variety of materials, such as wood and polyethylene plastic. [2]
But because methane (CH 4) emissions from the natural gas fuel cycle [74] dwarf the greenhouse impact of CO 2, the net greenhouse emissions (CO 2 e) from gas-driven systems are vastly greater than for solar heaters, especially if supplemental electricity is also from carbon-free generation. [citation needed]
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Similar stills are included in some life raft survival kits, though manual reverse osmosis desalinators have mostly replaced them. [2] Today, a method for gathering water in moisture traps is taught within the Argentinian Army for use by specialist units expected to conduct extended patrols of more than a week's duration in the Andes' arid ...