https://www.interez.sk/na-sibiri-sa-po-130-tisic-rokoch-topi-permafrost-rucaju-sa-cesty-tvoria-giganticke-kratery/2a7d78d900000578-3159067-some_scientists_have_expressed_concern_at_the_holes_erupting_clo-a-9_1436788627332/ byť smart je interez Sun, 06 Aug 2017 15:12:43 +0000 hourly 1