In Sunday’ sermon St Matthew wants his readers to grasp that Jesus is the promised King; the king who would rule over God’s promised kingdom; and that as such he has authority over all of creation, including the environment. When mankind rebelled against God, not only was mankind affected by the consequences of that rebellion (sin) but all of physical creation was also subjected to negative effects. And the king is coming to make all that right. The account in Matthew 8 is a demonstration of the authority of the king.