Researchers see potential in planting more wildflowers on solar farms to help reverse the worrying declines in bees, butterflies and other key pollinating insects observed in recent years. Solar panel sites are expected to take up six million acres of land before 2050. Scientists see this as an opportunity to reclaim land for pollinating species by replacing the usual grass or gravel at these sites with wildflowers that need insects to pollinate them, and that produce the nectar these insects eat.