Captain Compost Heap (CCH) sings a song about the importance of recycling, conserving the environment, and reducing pollution. The song explains the adverse effects of neglecting the environment and provides insight into the factors causing global warming.
The Lorax confronts the Once-Ler, who has been cutting down Truffula trees to manufacture Thneeds. The two witness the cutting down of the last Truffula tree, marking an end to the viability of the Once-Ler's business. The lack of trees also adversely affects the environment, as is evident by the coughing of the residents of ThneedVille and the migration of all the wildlife.