Airline asks passengers to use the toilet before boarding... so they will weigh less and help cut carbon emissions

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A Japanese airline has started asking passengers to go to the toilet before boarding in a bid to reduce carbon emissions.

All Nippon Airways (ANA) claims that empty bladders mean lighter passengers, a lighter aircraft and thus lower fuel use.

Airline staff will be present at boarding gates in terminals to ask passengers waiting to fly to relieve themselves before boarding, The Independent reported.

ANA hopes the weight saved will lead to a five-tonne reduction in carbon emissions over the course of 30 days.