The UN climate conference in Copenhagen today approved a deal to tackle global warming proposed by world leaders, after an accord Barack Obama brokered with China, India, Brazil and South Africa.

But the UN Secretary General today admitted the non-binding agreement at the conclusion of the conference was not "everything everyone had hoped for", as he confirmed a deal had finally been done.

Delegates have agreed to "take note" of the American-led Copenhagen Accord, despite criticism that there are no long-term targets to cut emissions and it is not a legally-binding treaty.

Obama had brokered the agreement with China, India, Brazil and South Africa to tackle global warming, which included a reference to keeping the global temperature rise to just 2C - but the plan does not specify greenhouse gas cuts needed to achieve the 2C goal.

Prime minister Gordon Brown said the Accord was a "necessary first step" but those in opposition to it described it as "weak" and "meaningless" .

The document setting out the deal will specify a list of countries which agreed with it, as some of the 192 nations which have taken part in the talks are understood not to have accepted it.

In stormy overnight talks Sudan, Nicaragua, Cuba, Venezuela and Bolivia all denounced the plan after about 120 world leaders left following a summit yesterday.

Sudan’s delegate, Lumumba Di-Aping, said the accord would condemn Africa to many deaths from global warming and compared it with the Holocaust.

But this morning UN Secretary General Ban Ki Moon said: "We have a deal" and described the agreement as an "important beginning" in the fight against climate change. It will allow a provision for $30 billion of climate aid for poorer countries over the next three years to become operational. There will also be a further $100 billion a year from 2020.

Mr Ban said: "The Copenhagen Accord may not be everything everyone had hoped for, but this decision...is an important beginning.”

Under the accord, countries will be able to set out their pledges for the action they plan to take to tackle climate change, in an appendix to the document, and will provide information to other nations on their progress.

UK Climate Change Secretary Ed Miliband, who spent the night in talks after Gordon Brown had left the conference, said the failure to secure a stronger agreement showed the difficulty world leaders faced in tackling climate change.