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Gold mining is notoriously energy-intensive, producing as much carbon each year as the emissions from about 28 million cars.
These parts are then prefabricated off-site, using local low-carbon materials produced with precision and little waste.
But both parts — getting oxygen in and getting carbon dioxide out — are equally important.
These act as a blanket, trapping the sun's heat, with carbon dioxide doing most of the damage.
But there’s also a third, hugely important player: the respiratory system, which acquires oxygen and gets rid of carbon dioxide.