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"Asking passengers to go to the toilet (before boarding) is just a small part of the program," said spokeswoman Megumi Tezuka, which includes using recycled paper cups and plastic bottles instead of glass.

"We are making these items lighter -- and making the passengers lighter, a little bit," Tezuka said.

The airline estimates that if 50 percent of passengers relieved themselves before boarding, it would reduce carbon dioxide by 4.2 tons a month.

Flights will also show educational films on the environment.

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