O2 has become the UK's first mobile broadband network operator to have its environmental impact monitored by the Carbon Trust.

According to the independent organisation, the process of transferring 1MB of data on the O2 network produces the equivalent of 11g of carbon dioxide, while a one-minute voice call results in the output of 3.6g of CO2 equivalent.

Under its Think Big Blueprint initiative, O2 is looking to deliver carbon benefits that have ten times the impact of its network over the next three years.

A Carbon Trust-commissioned survey previously found that 56 per cent of consumers would show more loyalty to a brand if it could demonstrate steps to slash carbon emissions.

Gareth Rice, head of environment at O2, said: "Our aim is to develop the UK's most carbon-efficient network, putting our own operations under the microscope and looking for ways to reduce the footprint we leave on the world."

The announcement comes five months after rival broadband provider TalkTalk revealed that 100 per cent of energy used by its next-generation network comes from renewable sources.

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