Last month, the Advertising Standards Authority received 93 complaints about 40 ads making green assertions. For the same month last year, it received 10 complaints about eight ads.
The number of grievances about environmental claims over the past 16 months has averaged 33 a month, but since June it has leapt to an average of 56 a month.
Green claims are becoming more prevalent in ads, from carbon-offsetting targets by energy providers to improved pollution figures from car manufacturers.
An ASA spokeswoman said: 'If advertisers make green claims, we will want evidence that they are true.' The ASA recently set out guidelines for what is acceptable.




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