Only a tiny minority of British businesses know how big their carbon footprint is, according to a survey by the Carbon Trust.

While a quarter of companies said they were affected by climate change, only 1% had actually measured their emissions.

"The picture is mixed as businesses are still yet to move in some key areas," said Tom Delay, chief executive of the Carbon Trust.

"By measuring and assessing a business's impact through undertaking a carbon footprinting exercise, a company can better understand where carbon reductions can be made and cost savings achieved."

The survey also revealed that 32% of firms have plans in place to reduce the amount their carbon footprint.