People had been dropping in on the party now for some years, fashionable gate-crashers from other worlds, and for some time it had occurred to the partygoers as they had looked out at their own world beneath them, with its wrecked cities, its ravaged avocado farms and blighted vineyards, its vast tracts of new desert, its seas full of cracker crumbs and worse, that their world was in some tiny and almost imperceptible ways not quite as much fun as it had been. Some of them had begun to wonder if they could manage to stay sober for long enough to make the entire party spaceworthy and maybe take
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