Folklore Behind The Wicker Man

When the harvest is bountiful, we all eat. But what do we do when nature fails us? If the rains refuse to come, or the insects amass an army against the crops, or the fruit withers on the vine, then we starve. Science can help, but even science has its limits. Then is the time to pray for help. But how to attract the attention of the heavens? Perhaps going to church? Perhaps a sacrifice. Surely a powerful being demands a powerful offering, maybe even human.