There's something about trees. Shel Silverstein's children's book classic "The Giving Tree" proves the point: Trees are sustenance. They provide comfort and love, even shelter. Unconditional love is what they bestow. But do we give back? As Tu B'Shvat...

JERUSALEM—The still-new recycling center in the Givat Shaul neighborhood of Jerusalem is fairly quiet on a crisp winter afternoon. Several people drive in to drop off their recycling—from old printers and batteries to aluminum pans, plastic containers...