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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]
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.
Calculators are available for estimating insolation at a site. [ 45 ] [ 46 ] [ 47 ] Below is a table that gives a rough indication of the specifications and energy that could be expected from a solar water heating system involving some 2 m 2 of absorber area of the collector, demonstrating two evacuated tube and three flat plate solar water ...