text: Apple CEO Lisa Jackson said the difficulty of using clean energy, such as wind power and sunlight, is unstable?
classes:  No, the sunshine energy is unstable due to rainy days, the system cannot store sunshine.  Besides, the sunshine energy is unstable due to rainy days, the system cannot store sunshine.  Yes, the sunshine energy is unstable due to rainy days, the system cannot store sunshine.  Meanwhile, the sunshine energy is unstable due to rainy days, the system cannot store sunshine.