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L'operatore canadese TransCanada ha annunciato giovedì la chiusura provvisoria dell'oleodotto Keystone, a causa della fuga all'alba di circa 5'000 barili di petrolio in South Dakota. Un'inchiesta è in corso e le squadre di emergenza sono intervenute.
L'oleodotto è lungo 4'324 chilometri e collega l'Alberta con di terminali per il greggio di Cushing in Oklahoma e Patoka in Illinois. In primavera Donald Trump aveva autorizzato la costruzione di un altro tubo fino al Golfo del Messico, il Keystone XL, al quale Barack Obama aveva messo il veto e che dovrebbe permettere a TransCanada di raddoppiare i quantitativi trasportati, a 830'000 barili al giorno. I nativi americani vi si oppongono.
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