International tree expert Guy Sternberg will give two presentations Dec. 7 in the East Union’s Great Plains Room.

Sternberg’s book, “Native Trees for North American landscapes,” is one of the top references on native trees.

The first brown-bag program, “Our Incredible Trees and a Changing Climate,” is noon to 1 p.m. The talk is about the importance of trees and what the impact from a changing climate might mean for them.

The second session, 1:30 p.m. to 2:30 p.m., offers a close look at “The Tree Cultivars of Starhill Forest.” The Starhill Forest is the private arboretum Sternberg developed near Petersburg, Illinois. It is home to one of the most diverse private collections of trees and shrubs in the country.

The presentations will be available for viewing online.

Participants are invited to bring lunch, ideas and questions. For more information, call the Arboretum at 402-472-2971, email arboretum@unl.edu or click here.