The Department for International Development (DfID) said the UK remained committed to the target.
The UK has no policies in place to meet more than half of the carbon emission cuts required by law by 2030, the government's official advisers warned on Thursday, the same day ministers committed to the target.
1990s Greener government In 1996, the Government published Making Waste Work, outlining its waste strategy and committing to the target of 25 per cent of household waste to be recycled by 2000.
More important, the Union backed down from previous suggestions that it would cut its emissions by 30 percent from 1990 levels by 2020, remaining committed to the target of a 20 percent cut it had initially promised.
Cristina Casalinho, chief economist of BPI, a Portuguese bank, said it was essential for the government "to pay more attention to staying very committed to the targets".
The comments come as pressure builds on the Conservative party to commit to the Nato target of spending 2% of GDP on defence beyond 2016.
If David Cameron remains prime minister, he will come under increasing pressure from his own MPs to commit to the Nato target as Britain's finances improve.
Labour should commit to the Nato target of spending at least 2% of national income on defence, leadership contender Liz Kendall has said.
Cameron refused for months before the general election to say whether the UK would continue to commit to the 2% target but George Osborne, the chancellor, eventually pledged last July that he would continue to hit the figure.
Indeed, even if Greece's debt is restructured beyond anything imaginable, the country will remain in depression if voters there commit to the troika's target in the snap referendum to be held this weekend.
Leo Varadkar told journalists he would raise Ireland's overseas development aid days after being lobbied by the pop star Bono to commit to the UN's target of giving 0.7% of GNP to the developing world.
