00:53, 28 Μαρτίου 2016 ('διαφορά' | ιστορικό) Ν ChristinBradford577 (Νέα σελίδα με 'What happens when the oil costs and production fees get too high? What if our fossil fuel provide runs out? What will occur then? Actually, to totally appreciate sustai...')(τελευταία)