Best-bets for July 2: ups and downs of “biocontrol”
1) “Human Footprint,” 9 p.m., PBS. The notion of “biocontrol” — one part of nature controls another — can work well: In Thailand, 10,000 ducks are released to gobble up farm pests. And it can fail: In 1935, Australia brought cane toads (shown here) to stop beetles; they soon swarmed everywhere … just as rabbits did earlier. Like last week’s opener, this is a terrific hour. Read more…