One of the most striking things in the days following 9/11 was the absence of air traffic. The sound of planes taking off and landing, the sight of jets zipping through the sky, have become such a part of the background noise of our lives, we noticed them only in their absence, and the silence of the skies in those couple days was deafening. The absence of children in the film Children of Men has much the same impact.
Imagine, if you will, a world without children. Not the temporary, blissful, child-free retreat of, say, a fancy restaurant, or a weekend away from the kids, but an entire world without a single child in it. No pregnant women, no families pushing strollers and shepherding toddlers, no preschoolers chasing bubbles, no schools or playgrounds, no kids building sandcastles or snowmen ... no future. The year is 2027, and for 18 years all the women on Earth have been infertile. From New York City to Paris, from South Africa to the South Pole, not a single baby has been born on the planet for nearly two decades.