India, Sept. 14 -- Spring in the Arctic is a time of cinematic change. Ice gives way to green grass and bright flowers. Insects, butterflies and spiders come out of hibernation. Polar bears emerge to mate and feast (on frolicking seals). Birds fly in, in the tens of millions, some from the literal ends of the earth. The Arctic tern travels all the way from Antarctica, to feed and breed near the North Pole. The thing about Spring here is, it is also very brief, typically just eight to 10 weeks long. For millions of years, this was enough. The little tern, and a range of other birds, bred, hatched and then cared for their young for the necessary six weeks or so, before they could start to fend for themselves. Now, that is changing. With ambie...