To me it speaks of the Millennial Reign of Christ. As it is an age of renewal with the Curse of Sin on the earth being lifted "he bluebirds sing And the flowers bloom, and the grass gets green", "the bees behave", "the ozone layer shows improvement" and "bringing life to the dead". It is also a time of peace on earth good-will toward men (see v2).
To me it speaks of the Millennial Reign of Christ. As it is an age of renewal with the Curse of Sin on the earth being lifted "he bluebirds sing And the flowers bloom, and the grass gets green", "the bees behave", "the ozone layer shows improvement" and "bringing life to the dead". It is also a time of peace on earth good-will toward men (see v2).