Legal action has been launched against the extension to 2070 of Woodside's North West Shelf gas hub. Photo: Rebecca Le May/AAP PHOTOS

An energy giant has vowed to "vigorously defend" two legal challenges sparked by the controversial extension of Australia's biggest gas project near ancient Aboriginal rock art.

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Woodside is set to weigh in to the landmark legal battle over the federal government's approval of the North West Shelf gas hub extension until 2070 in Western Australia.

The first legal challenges to September's commonwealth approval have been launched by conservation groups

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