Conservative MP Zac Goldsmith has highlighted that party leaders "fought to prove they were the greenest" during the 2010 General Election campaign.
Calling them "muppets," he wrote on Twitter:
In 2010, leaders fought to prove they were the greenest. 3 yrs on, they're desperately blaming their own policies on the other. Muppets.
His comments came after David Cameron promised to roll back "green regulation" imposed by the Labour Government
Scottish Power has increased its gas and electricity bills as rifts appear in the Coalition over green energy taxes.
David Cameron has announced a review of competition in the energy market and vowed to roll back green regulations.