imagine what we'll be able to build when we really need something. When the floods start, and the graphs spike red, and we panic. When the last tiger dies, followed by the last polar bear, and the last song thrush, and we are alone - feeling the terrible melancholy, and dishonour, of being the only species left on the planet. Then - when the apocalypse arrives, finally, on our doorstep - we will galvanise, and raise forests, and refreeze the poles, and hatch and release a billion songbirds into the air, because, because - because if we can make New York, we can make anything.