His hope is that visitors realize how important trees are to society.
"People take trees for granted," he said. "You can really understand more about them here."
On the third level, Timothy Allred helps Scouts recognize smart energy. Scouts jump on a stationary bike and pedal to provide kinetic energy to three types of light bulbs: incandescent, fluorescent and LED.
"That illustrates to the kids that it takes less effort and less energy for a smart light bulb," Allred said. "You can't teach kids in a classroom. That's why we have them on this bike and this exhibit."
The treehouse also includes an elevator completely powered by sustainable energy produced on-site. When exiting the treehouse, visitors receive a Jamboree sustainability merit badge.
Starting Jan. 1, the sustainability badge becomes a requirement for Eagle Scouts as an alternative for the environmental science badge.
"It [the sustainability badge] requires the boys to engage in measuring their [energy] output, basically at a home level, so they can see how much energy they're using," Allred said.
The hope is that Scouts become sustainable themselves. At the top of the treehouse, thousands of tiny tags blow in the wind. Each tag has a name etched on it of a Scout who signed a sustainability commitment.
Gundelach and O'Donnell signed their names and said they hope to bring more sustainable energy ideas home with them.
Reach Caitlin Cook at caitlin.c...@wvgazette.com or 304-348-5113.