New York Times: WHEN my oldest son returned from a first-grade field trip last year insisting that our family start composting, my heart did not exactly soar. After six years of changing diapers, I wasnt looking to take on additional waste-management responsibilities. I switched the subject, and our melon rinds and abandoned cheese sticks continued their steady march into the trash. Then my middle son started kindergarten. On the second day, he, too, arrived home to proclaim the need to compost, explaining that...