Ozone layer breakdown of ozone in the stratosphere results in reduced absorption of ultraviolet radiation. Consequently, unabsorbed and dangerous ultraviolet radiation is able to reach the Earth’s surface at a higher intensity. Ozone levels have dropped by a worldwide average of about 4 percent since the late 1970s. For approximately 5 percent of the Earth's surface, around the north and south poles, much larger seasonal declines have been seen, and are described as "ozone holes". The discovery of the annual depletion of ozone above the Antarctic was first announced by Joe Farman, Brian Gardiner and Jonathan Shanklin, in a paper which appeared
The Layer Quaternity God on High" and "I will exalt thee my God" ". (Latin upper captions translated) Libavius' illustration and the marble sculpture of the Layer Quaternity share an identical pairing including a naked figure (lower pair), a bare-legged royal male and a regal draped female (upper pair) as well as the titled captions "Gloria" and "Labor", along with the symbols of palm branch, "rotundum", and moon. The similarities between the captioned phrases of Libavius' illustration to those of the single-word titles of the Layer Quaternity suggest that in time sequence, the Layer monument was based upon and installed before 1606, the