The oxygen becomes the gas O2, which is released as waste back into the atmosphere.
They are taught about the importance of renewal and composting their dining hall waste back into the soil.
In the United States, most major oil companies have been reinjecting waste back into wells since at least the 1970's.
A tube extension, bizarrely considered a priority by central government, has dragged this last post-industrial waste back into service.
In an statement on Thursday morning, Lynas described the conditions of the two-year initial license without mentioning the possibility of bringing waste back to Australia.
Increasingly, American firms may opt to set up ordinary factories in Mexico, which would not have to send their waste back home.
Protesters blocked a train carrying nuclear waste back to Germany on Friday, chaining themselves to train tracks a few hundred yards from the railway station in Caen, in northwestern France.
Though Ecuador had no environmental laws governing the disposal of waste -- a point Texaco lawyers have used to make their case -- the lawyers for the plaintiffs say the company ignored long-established practices of reinjecting waste back into wells.
Environmental advocates estimate that Texaco made more than $20 billion in profits from its two decades in Ecuador, but would have had to spend up to $5 billion to reinject the waste back into the ground.
But there have also been scarier roadblocks, as when Mr. Colborn and Stuart I. Smedley, his chief technology officer, reached the painful conclusion that a system they had adapted from other researchers for converting wastes back into recyclable fuel was hopelessly unreliable.
Mexican law says maquiladoras must send their toxic waste back to the country the raw materials came from but, with enforcement weak and repatriation expensive, many are probably ignoring the law, says Victoriano Garza, of the Autonomous University of Ciudad Juarez.Mexico has long been a dumping-ground for unwanted rubbish from the United States.
