The rainbow is the sign of God’s covenant to all the people. When we see it, we are reminded that He will not bring about judgment via a world-wide flood ever again. This is not to say that He will not bring judgment, but not in the means of a flood. Every time we see a rainbow, we should rejoice in God’s promise to us.
It is at this point that He also states that we will always have the seasons in the order we have them. “I will never again curse the ground for man’s sake, although the imagination of man’s heart is evil from his youth; nor will I destroy every living thing as I have done. While the earth remains, seedtime and harvest, cold and heat, winter and summer, and day and night shall not cease (Genesis 8:21-22). This is God’s promise against global warming, or global cooling.