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The TPRC Data Book has been quoting de Vries with values of 0.0251 and 0.0109 W⋅cm −3 ⋅Kelvin −1 for the thermal conductivities of organic and dry mineral soils respectively but the original article is free at the website of their cited journal.
Solar water heating (SWH) is heating water by sunlight, using a solar thermal collector.A variety of configurations are available at varying cost to provide solutions in different climates and latitudes.
The first real mention of 'green' or 'eco-tourism' on a world-wide stage was in the Agenda 21 for the Travel and Tourism Industry, published in 1997 by the World Tourism Organization. [2]