I walk out of the late summer heat and into the artificial chill of the air-conditioned grocery store. Although the seasons have changed dramatically in my neighborhood over the past several weeks, the shelves of shining vegetables arranged into stage-lit piles look virtually unchanged. Is there drought in California? Have there been floods in the Philippines? Is the changing climate changing the altitude at which apples can be grown in certain regions? The constancy of selection here betrays no hint…