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justice and change. and off cape cod tonight, the lobster diver who says he was attacked by a humpback whale. trapped in its mouth for at least 20 seconds. >> announcer: from abc news world headquarters in new york, this is "world news tonight" with david muir. good evening, and it's great to have you with us as we near the end of another week together here. we begin tonight with president biden on the world stage, the g-7 summit, the first summit since the pandemic. the leaders of the world's democracies pledging action tonight. first the u.s. revealing 500 million doses of the vaccine for poorer nations. tonight, the rest of the g-7 pledging to match that now. now 1 billion doses of the pfizer vaccine for countries in need. and the royal welcome tonight for the bidens and queen elizabeth on that stage, too, what she said to fellow world leaders. her trademark wit making them laugh. you'll see it. and the image we haven't seen in two years. the g-7 leaders socially