David Cameron, Nick Clegg and Ed Miliband have pledged to work together in a bid to tackle climate change.

The Prime Minister, Deputy Prime Minister and the Leader of the Opposition have signed an agreement in a rare sign of unity three months before the general election.

They have pledged to seek a “fair, strong, legally binding” global climate deal, work together “across party lines” to agree carbon budgets and boost the transition to an energy efficient, low carbon economy as well as end the use of unabated coal for power generation.

“Acting on climate change is also an opportunity for the UK to grow to a stronger economy, which is more efficient and more resilient to the risks ahead. It is in our national interest to act and to ensure that others act with us,” the joint statement said.

The declaration has been hailed as “inspiring leadership and true statesmanship” by former US Vice President Al Gore.

The news has also been welcomed by multinational businesses.

Paul Polman, CEO of Unilever said: “The importance of this pledge cannot be overstated. In this critical year, this statement… sets a terrific example for other countries to follow.”

The agreement was brokered by environmental charity Green Alliance and supported by Christian Aid, Greenpeace, CAFOD, WWF and the Royal Society for the Protection of Birds.