It was an improbable scene in Dubai as a top oil executive basked in a standing ovation from hundreds of diplomats tasked with fighting climate change.Sultan Al Jaber, head of the United Arab Emirates' state-owned oil company, had just presided over the two-week COP28 summit that led to the world's first agreement to move away from fossil fuels. There were tears, hugs and claps on the back as exhausted delegates celebrated a milestone in the battle against global warming.