In the story "The Lorax" by Dr. Seuss, the Once-ler presents a critical message about environmental stewardship when he drops the last Truffula seed. This seed represents the last opportunity to nurture and restore the Truffula trees, which are essential for the well-being of the environment and the animals that depend on them. The Once-ler emphasizes that the responsibility of caring for this seed lies in the hands of the reader, urging them to take action to protect nature.

The Once-ler advises planting the seed with diligence, highlighting the importance of giving it clean water and fresh air. He stresses the need for proactive care to encourage the growth of new Truffula trees. By fostering a thriving forest, the hope is that the Lorax and his friends, who symbolize the guardians of nature, will return. This poignant call to action serves as a reminder of our duty to safeguard the environment for future generations.