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Sosialismin saavutukset: öljyn ja ruuan hinta karkaavat
Uusiutuva energia [Tuomas Kangasniemi, 28.04.2008]
Namibialaisesta aurinkovoimalasta maailman korkein rakennus? Saksalainen insinööriryhmä suunnittelee Namibiaan kilometrin korkuista aurinkotornia. |
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