Final answer:
Green plants require solar energy for photosynthesis and survival, as well as to provide energy for other organisms.
Step-by-step explanation:
Green plants require solar energy for the process of photosynthesis, where they convert carbon dioxide and water into glucose using solar energy. Without solar energy, plants would not be able to produce glucose, which is essential for their growth and survival. Additionally, plants are at the bottom of the food chain, and organisms higher up depend on plants for their energy and survival.