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If the G20 was a dress rehearsal for COP26, then world leaders fluffed their lines, their communique was weak, lacking both ambition and vision, and simply failed to meet the moment. Now they move onto Glasgow where there is still a chance to seize a historic opportunity, but the likes of Australia and Saudi Arabia need to be marginalised, while rich countries need to finally grasp that the key to unlock COP26 is trust.