NBC Nightly News Full Broadcast - September 21st, 2021

Johnson & Johnson says additional shot boosts protection against Covid, remains found in Wyoming identified as Gabby Petito, and President Biden calls for global cooperation on Covid and climate change in first U.N. speech.

00:00 Intro 01:22 Covid booster shot confusion 04:35 Remains found in Wyoming identified as Gabby Petito 07:19 Biden first U.N. speech 09:45 Biden vows to get border emergency 'under control' 13:12 Hospitals and ICU's reach capacity 15:35 Climate change ravaging crops in Guatemala 19:00 Race to save world's largest tree

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