Earth's most massive living thing is struggling to survive

What looks like 47,000 separate trees spread out over 106 acres in Utah are actually all offshoots from a single, massive Aspen tree root. It’s known as Pando and it is believed to be the largest living organism on Earth. But scientists say that overgrazing by deer and elk is now threatening Pando's survival. NewsHour Weekend's Christopher Booker reports.