With temperatures breaching the Paris limit, experts say tackling the powerful gas could buy crucial time as the clean-energy shift stalls Cop30: click here for full Guardian coverage of the climate talks in Brazil With temperatures breaching the Paris limit, experts say tackling the powerful gas could buy crucial time as the clean-energy shift stalls Cop30: click here for full Guardian coverage of the climate talks in Brazil F or two years, global temperatures have exceeded the 1.5C heating