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China is the host of this year's G20 summit. This more active role of China in global governance is a reflection of a changing world. The Hangzhou summit also reflects another significant change: Climate action and sustainable development are no longer considered side discussions, but are centrally on the G20 agenda. The G20, traditionally a forum to discuss financial stability and economic policy, are beginning to reflect the fact that unsustainable development and unmitigated climate change are huge risks to a stable and prosperous world economy.