NICK Clegg mocked the Prime Minister as he set out how the Liberal Democrats would push through major environmental reforms if they were returned to government, telling activists:

"It's not green crap to us".

The Deputy Prime Minister said the party was committed to five green laws that include plans to give everyone access to green space, boost energy efficiency, and move towards green cars.

Mr Clegg said the Lib Dems had to exert "constant pressure" on their coalition partners to ensure environmental pledges were met.

Last year, David Cameron was reported to have told Tories: "We've got to get rid of all this green crap".

Mr Clegg said: "Both parties in this Government promised we would stick to our green commitments, but it has taken constant pressure from the Liberal Democrats to hold the Tories to their word.

"And I can tell you that a sustainable environment will remain at the heart of our vision for Britain's future - it's not green crap to us."

The LibDem leader said the biggest ever commitment to renewable energy had been designed and delivered by his party and claimed the environment had been "safeguarded for future generations".