// SUSTAINABILITY: ENVIRONMENT
With sustained attention, stronger commitments and rising compliance, the challenge is to turn political intent on environment into measurable progress for real-world impact G20 performance on environment
S outh Africa’s 2025 G20 presidency, with its themes of ‘Solidarity, Equality, Sustainability’, places the environment at the centre of the forum’s governance. With the African Union now a permanent member, the G20’s expanded constituency and scale strengthen the mandate to convert political intent into measurable outcomes. The Environment and Climate Sustainability Working Group, chaired by South Africa’s environment minister Dion George, has convened throughout the year to align the deliverables of the sherpa and finance tracks. The stakes are high: global environmental pressures persist even as the G20’s attention, decisions and delivery have risen. The question for 2025 is whether this presidency can turn established momentum into specific, near-term actions that produce visible gains. DELIBERATIONS Leaders have moved the environment from the margins to a stable place in terms of the number of words they devote to the issue in their declarations. Period averages step up from 4% in 2008–2016 to 14% in 2017–2020 and 15% in 2021–2024. Early attention was limited and uneven, with no more than 4% between 2008 and 2015 before an inflection in 2016 to 15%. The higher baseline then held, despite a few dips: 10% in 2017, 2% in 2018, 21% in 2019, 21% in 2020, 19% in 2021, 8% in 2022, 12% in 2023 and 21% in 2024. This record confirms durable agenda space entering 2025. DECISIONS The environment’s share of leaders’ commitments has likewise risen from negligible to durable levels. Period averages increase from 1% (2008–2016) to 6% (2017–2020) and 10% (2021–2024), including 10% at Rio de Janeiro in 2024. The early phase contained sparse agreements (generally less than 1%). A structural shift arrived in 2017 to 11%; although it fell in 2018 to 0%, output resumed in 2019 with 5% and 2020 with 6%, and then stabilised near one-tenth of all commitments in 2021 (9%), 2022 (11%), 2023 (8%) and 2024 (10%). This regularity provides predictable entry points for implementation planning and peer review. DELIVERY Delivery on those commitments has strengthened sharply, according to the G20 Research Group’s assessments of G20 members’ compliance. Period averages rise from 49% (2008–2016) to 62% (2017–2020) and 84% (2021–2024), above the 71% all-subject average in the latest period. By May 2025, compliance with the one assessed commitment made at Rio in 2024 had 81%, consistent with the post-2020 step-change. Summit snapshots follow the Siobhan Mehrotra, senior researcher, G20 Research Group
88 // G20 SOUTH AFRICA: THE JOHANNESBURG SUMMIT 2025
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