Black Site, Utah: The new UN has tasked Jack Crowley to convene a team of scientists to discuss a problem of global impact; the current world population is 13.29 billion, well up on the old UN's forecast earlier in the century. The team's 2090 target is 5.5 billion, and Crowley has only eighteen years to achieve it. He sets his team a set of six options of approach, and the pros and cons of the six options are threshed out for the consideration...