HANAPEPE, Kauai >> On a warm summer afternoon, Tina Tani­guchi was on her hands and knees scraping dirt off an oblong depression in the ground. Thick brown hair peeked out from her coconut leaf hat.

HANAPEPE, Hawaii (AP) — Over the past decade, this tract has been under constant threat due to development, pollution from a neighboring airfield, sand erosion from vehicle traffic and littering by ...