London Climate Action Week opened on 23 June, marking the tenth anniversary of the Paris Agreement with a nine-day programme expected to draw some 45,000 participants to more than 700 events across the UK capital. Organisers have cast the festival as a springboard for stronger climate commitments ahead of November’s COP30 summit in Belém, Brazil. London Mayor Sadiq Khan and Paris Mayor Anne Hidalgo launched the week by pledging joint action against climate disinformation and urging national governments, technology platforms and media outlets to protect democratic debate and accelerate decarbonisation. Khan later told a Goals House gathering that London, the first global city to declare a climate emergency, will use the week to showcase urban leadership on climate solutions. Prince William used an Earthshot Prize investment forum at Guildhall to press financiers to move beyond “accepting the status quo”. Noting that only 17 percent of the world’s land and three percent of its oceans are fully protected with just five years left to meet 2030 biodiversity targets, the prince said greater capital is needed to scale nature-based and technological solutions. Corporate executives and academics at a two-day Project Syndicate conference examined how companies can maintain sustainability momentum amid political headwinds. HSBC climate-transition head Seb Henbest and World Resources Institute vice-president Stientje van Veldhoven outlined cost and regulatory hurdles to decarbonising supply chains, while campaigners such as Erinch Sahan argued that a search for superficial “win-wins” is slowing systemic change. Delegates also used the London platform to prepare for COP30. Brazil’s environment minister Marina Silva said the Belém conference must serve as a “new referential” for implementing past pledges, while state utility Itaipu Binacional highlighted that Brazil already derives half of its electricity from renewable sources—compared with a 14 percent global average—and is investing in green hydrogen and sustainable aviation fuel to support the transition.