TODAY 8a: United Nations General Assembly. How oysters are reused to save our waters. Poet Amanda Gorman on new children’s book.

<p>The United Nations General Assembly is taking place today — Chief White House correspondent Peter Alexander is recapping President Biden’s address. Plus on “TODAY Goes Green,” Harry Smith has an in-depth look at how the oysters we eat are reused to help save our waters. Also ahead, Poet Amanda Gorman chats with Savannah Guthrie and Hoda Kotb about her new children’s book “Change Sings.”</p><p> </p>