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Find these stories and much more when you grab a copy of The Guardian on Saturday.

In tonight's edition: Mauritania and Chad say they're calling time on the G5 Sahel anti-jihadist alliance. Also, Ethiopia's Grand Renaissance Dam offers huge renewable energy prospects, but is also responsible for troubled waters with neighbours Egypt and Sudan. And in DR Congo, election campaigning is in full swing ahead of crucial polls later this month.

More precise than other methane-sensing satellites that came before, MethaneSAT will allow scientists to track emissions to their sources and provide key data for reduction efforts. It's important because it could buy the world critical time in the climate change battle.

They cover 70 percent of the planet, with over 3 billion people relying on them for their livelihoods. Oceans should be a major priority when it comes to addressing climate action. But they are in the unique position of being among the biggest victims of global warming and also offering possible solutions.

Twenty countries agreed at the COP28 climate summit to triple their nuclear energy capacity by 2050 to reduce carbon emissions. How feasible is the target given the complexities and cost of building new nuclear plants?

In an interview with FRANCE 24, former Ukrainian president Petro Poroshenko (2014-2019) reacted to the US Senate withholding a major package of financial and military aid for Kyiv. Poroshenko warned that the coming days are among "the most important in Ukrainian history" and undoubtedly for the world.