After 13 days of talks and several sleepless nights in a country built on oil wealth, the Emirati president of the UN-led COP28 summit banged a gavel to signal the world had reached consensus.
"You did step up, you showed flexibility, you put common interest ahead of self-interest," said COP28 president Sultan Al Jaber, whose role as head of the United Arab Emirates' national oil company raised suspicion among many environmentalists.
Describing the deal as bringing "transformational change" on climate, Jaber said of the UAE's diplomacy: "We have helped restore faith and trust in multilateralism, and we have shown that humanity can come together."
EU climate chief Wopke Hoekstra called the agreement "long, long overdue", saying it had taken nearly 30 years of climate meeting to "arrive at the beginning of the end of fossil fuels".
But with the UN talks requiring consensus, Jaber carefully calibrated the text to bring onboard countries from islands that fear extinction from rising sea levels to oil giant Saudi Arabia, which led the charge to keep exporting its petroleum.
Toughening language from an earlier draft that was roundly denounced by environmentalists, the agreement calls for "transitioning away from fossil fuels in energy systems, in a just, orderly and equitable manner".
It calls for expanding action "in this critical decade" and recommits to no net greenhouse gas emissions by 2050 in hopes of meeting the increasingly elusive goal of checking warming at 1.5 degrees (2.7 Fahrenheit) above pre-industrial levels.
The planet has already warmed by 1.2 degrees and scientists say 2023 was likely the warmest in 100,000 years, as storms, droughts and lethal wildfires expand around the world.
- Islanders still alarmed -
The negotiator from the Marshall Islands had warned that an earlier draft marked a "death warrant" for his nation, which is just 2.1 metres (seven feet) above sea level.
The small islands did not block the Dubai deal, but a representative from Samoa criticised the language as too weak after contending the group had not arrived yet in the room at Dubai's sprawling Expo City when Jaber declared consensus.
"We have made an incremental advancement over business as usual when what we really needed is an exponential step change in our actions," Samoan chief negotiator Anne Rasmussen said on behalf of the island nations, drawing a standing ovation and polite applause from Jaber.
Brazil, which will lead the climate talks in 2025 in the Amazon, said that wealthy nations must now deliver on another key climate pledge -- providing assistance to worst-hit developing nations.
But US climate envoy John Kerry said that no side can ever achieve everything in negotiations and praised the deal as a sign a war-torn world can come together for the common good.
"I think everyone has to agree this is much stronger and clearer as a call on 1.5 than we have ever heard before, and it clearly reflects what the science says," Kerry said.
A Saudi representative voiced "gratitude" to the UAE efforts, calling the outcome a "great success".
The text stopped short of backing appeals during the summit for a "phase-out" of oil, gas and coal, which together account for around three-quarters of the emissions responsible for the planetary crisis.
But it goes well beyond Jaber's earlier draft that merely suggested that nations "could" reduce the consumption and production of fossil fuels, among other options.
Environmentalists virtually all saw the agreement as a step forward, although many cautioned that there will still far more to do.
"We are finally naming the elephant in the room. The genie is never going back into the bottle and future COPs will only turn the screws even more on dirty energy," said Mohamed Adow, director of the Power Shift Africa think tank, referring to the annual UN climate meetings known as Conferences of the Parties.
"Some people may have had their expectations for this meeting raised too high, but this result would have been unheard of two years ago, especially at a COP meeting in a petrostate," he said.
- More ambition, but with loopholes -
The agreement also made more explicit the near-term goals in the goal of ending net emissions by 2050.
It called for the world to cut greenhouse gas emissions by 43 percent by 2030 compared with 2019 levels.
But Jean Su of the Center for Biological Diversity, while seeing progress, said there were still "cavernous loopholes" for fossil fuels.
The agreement tackles only fossil use in energy, not in industrial areas such as production of plastics and fertiliser.
She also voiced alarm at the recognition of the role of "transitional fuels", which she saw as a codeword for producers of natural gas and other fossil fuels such as the United States on the grounds of energy security.
The deal backs a phase-down of "unabated" coal power -- meaning it preserves a role for the dirty but politically sensitive energy source if there is use of carbon capture technology, panned by many environmentalists as unproven.
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