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Meanwhile, in the UK, political leaders are showing rare unity:
14 February 2015 Last updated at 00:56
The pledge includes an undertaking "to end the use of unabated coal power"
'Unusual' joint commitment: Cameron, Clegg and Miliband
The leaders say action on climate change is an opportunity to grow a stronger economy
Party leaders make joint climate commitment
The pledge includes an undertaking "to end the use of unabated coal power"
The UK's political leaders have pledged to work together to combat climate change, whatever the election result.
In a joint statement, David Cameron, Ed Miliband and Nick Clegg said climate change was one of the most serious threats facing the world.
They said climate change threatens not just the environment but also security, prosperity and poverty eradication.
They have promised to end coal burning for power generation in the UK - unless it uses new clean-up technology.
Environmentalists say the pledge is significant because it quells some of their fears that the Conservatives might adopt a more climate-sceptic line, to mirror UKIP's position.
'Moment of unity'
The move will be noticed by the UK's European partners working towards a global agreement on climate change at the UN conference in Paris in December. Some of them had been nervous that the UK might soften its leadership position in the talks, given the level of climate scepticism expressed by some newspapers and Conservative backbenchers.
The statement will also please investors who have been deterred from sinking money into renewable energy systems because they feared a withdrawal from climate policies.
It has been brokered by Matthew Spencer of the think tank Green Alliance, who He told BBC News: "The purpose is to create space for the current and future PM to ensure that the UK can play a full role in securing a good outcome in Paris.
He added that another aim was "to reassure investors that agreement remains strong across current leaders on emissions reduction, and that we're unlikely to see a major change in direction whichever party forms the next government".
"It's very unusual to get a moment of unity in the midst of a general election, and it is generating lots of excitement. A non-partisan approach is the holy grail in the US. It is in our national interest to act and to ensure that others act with us."
'Unusual' joint commitment: Cameron, Clegg and Miliband
The leaders have gone so far as to promise to ban "unabated" coal-fired power generation - meaning that, if it is to continue, the emissions will need to be captured and stored in rock formations. This decision has been long debated and will send a strong signal of intent to the power industry.
The leaders state: "Acting on climate change is an opportunity for the UK to grow a stronger economy more efficient, and more resilient to risks ahead."
They pledge:
- to seek a fair, strong, legally binding, global climate deal which limits temperature rises to below 2C
- to work together, across party lines, to agree carbon budgets in accordance with the Climate Change Act
- to accelerate the transition to a competitive, energy efficient low carbon economy and to end the use of unabated coal for power generation
Critics fear that combating climate change will make energy unaffordable. UKIP says climate change fears are inflated and the party's UKIP's energy spokesman recently said his party wanted to repeal the Climate Change Act, which commits the UK to step-by-step reductions in CO2 until 2050. He said the relationship between CO2 levels and global temperatures is "hugely open to question".
Labour leader Ed Miliband recently restated that tackling climate change "goes to the heart of" his beliefs. A Liberal Democrat source said tackling climate change was in the party's DNA.
The Green Party says the UK should be making much more urgent progress towards getting the country powered by renewables.
The leaders say action on climate change is an opportunity to grow a stronger economy
Greenpeace welcomed the new statement. Its director John Sauven said:
"This pledge marks a turning point in the collective effort to take Britain's energy system out of the Victorian age and into the 21st century. Party leaders now need to set a clear expiry date on coal pollution, stop subsidies to coal plants, and start investing in the clean energy infrastructure this country really needs."
Industry leaders will need reassuring about how this can be done without pushing up energy prices and making the UK uncompetitive.
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Parties in pact on climate change | Daily Mail Online
UK political leaders in joint pledge on climate change - FT.com
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