BRUSSELS (Reuters) - The European Union agreed a deal on Friday to help developing nations combat climate change and urged other world powers to follow suit to win the fight against global warming. EU leaders bridged a rift between rich and less prosperous member states after two days of summit talks, enabling them to agree a joint position for talks in Copenhagen in December on a new global pact against climate change. The agreement was a relief for the EU leaders who also made progress towards ratification of a treaty to increase the blocs global influence but acknowledged an extra summit may be needed to decide who will be their first president. They are looking for a leader who will help reinforce the 27-country blocs standing on the world stage but have made clear it will not be former Prime Minister Tony Blair. We can now look the rest of the world in the eyes and say we have done our job, we are ready for Copenhagen, said Jose Manuel Barroso, the president of the EU executive, the European Commission. We can take this message to Washington, to New Delhi, to Beijing and elsewhere... We are now at a very critical moment. There are many people who believe that the Copenhagen summit is at risk. I think, we think, that we can make it a success. Meanwhile, Prime Minister Gordon Brown said on Friday that European Union leaders have agreed what they will offer other countries during global climate negotiations in Copenhagen in December. The EU leaders, attending a two-day summit, have been working on a negotiating mandate for the Copenhagen talks to find a successor to the Kyoto Protocol, the United Nations anti-climate change scheme which expires in 2012. Europe is making three conditional offers, money on the table, saying we will do everything we can to make a climate change deal happen, Brown told reporters. I think this is a breakthrough that takes us forward to Copenhagen and makes a Copenhagen agreement possible. The worst financial crisis since the 1930s has distracted attention from global warming and the United Nations and many countries say a legally binding treaty is impossible at the Copenhagen meeting from December 7-18. Funding is central to the chances of success in Copenhagen because developing countries say they will not sign up to tackling climate change without enough funds from rich nations. Barroso and other EU leaders gave few details of how a deal was reached to ease the concerns of eastern European states over how much money they will asked to provide to help poor nations tackle the effects of global warming. A EU statement said the member states had agreed developing nations would need about 100 billion euros (89 billion pounds) each year by 2020 to tackle climate change. Of that sum, about 22-50 billion euros would have to come from public funds, as opposed to industry and the EU would put up about one quarter of that sum. We have reached a compromise that is good for climate and addresses the concerns of poorer EU countries, Polish Prime Minister Donald Tusk said. There are no losers. Everyone gave ground a bit, but the deal is good for everybody. Tusk was among leaders criticised in a letter by South African cleric Desmond Tutu, who urged world leaders to do more to make a deal possible in Copenhagen. World leaders are backtracking, mumbling about domestic difficulties and lack of time whilst the European Union, previously progressive champions for action on climate change, is paralysed by the unseemly bickering amongst its member states over who will pay the bill, he wrote. The leaders reached an agreement on Thursday that opened the way to ratification of the Lisbon treaty, which would ease EU decision-making, create an EU president and increase the powers of its foreign policy chief. Under the deal, the leaders accepted Czech President Vaclav Klauss demands for an opt-out from a rights charter attached to the treaty, to shield the Czech Republic from property claims by ethnic Germans expelled after World War Two. I have accepted the decision of the Brussels European summit, Klaus said. I am not going to raise any further conditions for the ratification of the Lisbon Treaty. Ratification by the Czech Republic, the only EU state that has not ratified, now depends on its constitutional court rejecting a legal challenge in a ruling expected on Tuesday. Blairs hopes of becoming EU president faded when his candidacy failed to secure the blessing of European socialists, his Labour Partys allies. Several EU leaders said a special summit would probably be held next month to discuss the job. The post is now more likely to go to a centre-right leader, especially as centre-right parties dominate the European Parliament and form a majority among EU leaders. No front-runner has emerged, but possible contenders include Dutch Prime Minister Jan Peter Balkenende, former Finnish prime minister Paavo Lipponen and Luxembourg Prime Minister Jean-Claude Juncker.