PBS News Weekend

The largest organism on Earth is dying. With 47,000 trunks spread out over a 106-acre section of Utah from a single massive root, the so-called Pando is considered to be the largest living organism on the planet. Rather than growing from seeds, Pando's saplings sprout from one root system. As older trees die, they are replaced by new saplings. But scientists say that after likely thousands of years in existence, overgrazing by deer and elk is killing the Pando's young saplings and threatening its survival. NewsHour Weekend's Christopher Booker reports.