I guess the CLEAN AIR ACT, after being implemented, worked TOO WELL. The atmosphere is so clean now, that more of the sun's rays are reaching the planet's surface than before they cleaned up the air.
Whatever happened to the hole in the ozone?
What many seem to ignore is that that hole in the ozone was part of a natural process of this planet.
The ice at the polar ice caps are the last remnants of the LAST ICE AGE. At one time, millions of years ago, the current north pole was just like the everglades in florida and there wasn't an ice cap.