Their case for plant rights stems from two factors: plants are sentient, and we depend on them. Mancuso asserts that plants have acquired a certain and necessary intelligence in order to reproduce, find energy, and protect themselves. Likewise, they have developed ways to attract pollinators with colors, smells, and food incentives in order to further their species. For energy, their roots grow to avoid obstacles and deter competition for water with other plants, and many release chemicals when harmed, often times only in the specific area under attack. Thus, Mancuso and Viola try to argue that plants' intelligence, and our dependence on plants for food, raw materials, and oxygen, should merit a movement toward plant rights. "Providing rights to plants is a way to prevent our extinction," Mancuso told The Guardian.