Cut-paper wizard Nikki McClure is a brilliant steward for the words of a pioneering environmentalist in this wondrous ode to clouds—and the scientific “language of the sky.”Rachel Carson once wrote, “It is not half so important to know as to feel.” What do we know about clouds? There are three basic types: stratus, cumulus, and cirrus. Some are fleecy and fair-weathered while others portend storms. But clouds are more than pretty or ominous backdrops. They’re the vehicle of w