<p>KIVALINA — As charter pilot Dave Lorring taxis a twin-engine Piper PA-31 Navajo through a dogleg in the Kivalina airstrip, he sees resident Perry Hawley waiting on top of a snowdrift with a snowmachine and a sled.</p> <p>As soon as the Navajo props stop spinning, out jumps Kenji Yoshikawa, there for one of his patented science hit and runs. Yoshikawa is soon kneeling on a long wooden sled towed by Hawley, who heads for a few wooden tripods standing on the white arctic plain outside town.</p>