"Without China and the United States aggressively moving forward to reduce emissions, we don't win this battle," the former secretary of state told reporters on the eve of the opening of COP28.
"We are number two (biggest emitter), they're number one... So we have decided to actually work together to get a successful COP," said Kerry, who mentioned his last meeting with China's long-standing climate envoy Xie Zhenhua earlier this month.
He said both countries -- who produce 40 percent of all greenhouse gases -- "need to step up and help get the job done at a faster rate" to limit warming to 1.5 Centigrade as was agreed at the Paris climate talks in 2015.
China is the world's biggest greenhouse gas emitter. But when past emissions are taken into account, it is second behind the US.
Fatih Birol, the head of the International Energy Agency (IEA), told AFP in September that he was appealing to both superpowers to put aside "their economic and geopolitical tensions" during the talks.
After months of discreet discussions, both countries released a joint climate statement in which they announced cooperation in various areas including on methane, the second most damaging greenhouse gas after CO2. It also mentioned common objectives from COP28.
The first official audit of the Paris agreement, which has to be agreed by consensus, is one of the most anticipated decisions due to be taken in Dubai.
"This global stocktake needs to earn the credibility of the world by being candid, strong, visionary and comprehensive," added Kerry.
He said the US would push for a "commitment to accelerate the phase out of unabated fossil fuels", meaning without carbon capture -- a key battleground at the talks.
"I feel confident that we're going to make progress. The question is how much progress," he added. "The proof is in the pudding."
Nations urged to take 'great leaps' at UN climate talks
Dubai (AFP) Nov 30, 2023 -
The UN climate conference opens in Dubai on Thursday with nations under pressure to increase the urgency of action on global warming and wean off fossil fuels, amid intense scrutiny of oil-rich hosts UAE.
The two-week-long climate negotiations being held this year in the glitzy Gulf city come at a pivotal moment, with emissions still rising and this year likely to be the hottest in human history.
Britain's King Charles III, world leaders, activists and lobbyists are among more than 97,000 people expected to attend what is being billed as the largest climate gathering of its kind.
The UN and hosts the United Arab Emirates say these talks, known as COP28, will be the most important since Paris in 2015, when nations agreed to limit global warming to well below 2C since the preindustrial era, and preferably to a safer limit of 1.5C.
Scientists say the world is not on track to achieve these targets, and nations must make faster and deeper cuts to emissions to avert the most disastrous impacts of climate change.
"Right now, we're taking baby steps where we should be taking great leaps and great strides to get us to where we need to be," said UN climate chief Simon Stiell on Wednesday.
A central focus will be a stocktake of the world's limited progress on curbing global warming, which requires an official response at these talks.
On Friday and Saturday, about 140 heads of state and government -- Pope Francis had to cancel last minute due to the flu -- are expected to articulate their ambition after a year of devastating floods, wildfires and storms across the globe.
- Host troubles -
The UAE sees itself as a bridge between rich developed nations most responsible for historic emissions and the rest of the world, which has contributed less to global warming but suffers its worst consequences.
But the decision for it to host has attracted a firestorm of criticism, particularly after the appointment of Sultan Al Jaber -- the head of UAE oil giant ADNOC -- to steer the talks as COP president.
The 50-year-old Emirati, who also chairs a clean energy company, has defended his record and resisted pressure from European and US lawmakers to stand aside.
Fears of a conflict of interest were given fresh life on the eve of COP28 when Jaber was accused of using the presidency to pursue fossil fuel deals in meetings with governments -- accusations he strenuously denied.
"It's an attempt to undermine the work of the COP28 presidency," he said of the accusations detailed in documents leaked to the BBC and the Centre for Climate Reporting.
- Background tensions -
Nations will navigate a range of thorny issues between November 30 and December 12 -- including the disputed future of fossil fuels and a long-running feud over climate finance for poorer countries.
Geopolitical tensions and building trust could be a huge challenge, experts say.
Israeli President Isaac Herzog and Palestinian Authority leader Mahmoud Abbas may cross paths on Friday, as they are scheduled to speak within minutes of each other.
Neither US President Joe Biden nor Chinese President Xi Jinping -- heads of the world's two biggest polluters -- are attending, though Washington and Beijing did strike a rare common note on climate this month that spurred optimism going into COP.
Sonia Dunlop, CEO of the Global Solar Council, said Wednesday it was hoped that more than 100 countries would agree to triple renewable energy by 2030 -- a flagship proposal being put forward by the COP hosts.
Rallying a common position on phasing out all fossil fuels -- a demand of climate-vulnerable island nations, and one supported by scientists and the International Energy Agency -- will be more challenging.
Any decisions at COP are made by consensus, meaning nearly 200 nations -- whether dependent on oil, sinking beneath rising seas or locked in geopolitical rivalry -- must traverse these fault lines to reach any agreement.
"In the end, the proof is in the pudding," said US climate envoy John Kerry on Wednesday.
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