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(61) John Pyle, a specialist on the ozone layer at the University of Cambridge, agrees that the research raises key questions.

(62) The ozone layer is a protective layer around the planet Earth.

(63) The surface UVB irradiance and erythemal UVB dose rate can be expressed by the effective transmission of the ozone layer and united reflectivity due to the scattering layer and the surface.

(64) Then, in 2006,(www.Sentencedict.com) London comedian Sue Perkins won with a tale about flatulent sheep causing a hole in the ozone layer. Ms.

(65) Many groups of scientists quickly began monitoring the Antarctic ozone layer.

(66) Space observations have revealed a 3 to 8 percent depletion of the ozone layer following the 1991 eruption of Mount Pinatubo in the Philippines.

(67) The most troubling of the short-lived HFCs were invented to replace chlorofluorocarbons, refrigerants that were thinning the ozone layer in the upper atmosphere, and were also a major warming agent.

(68) The ozone layer blocks much of the sun's dangerous ultraviolet radiation.

(69) Once photosynthesis had raised atmospheric oxygen levels high enough, the ozone layer formed, meaning that it was then possible for living things to venture onto the land.

(70) Our protective ozone layer above the earth has been thinned.

(71) Chlorine from chlorofluorocarbons, or CFC's, is responsible for destroying part of the ozone layer over Antarctica.

(72) But due to the problem of chlorofluorocarbon (CFC) in environmental protection, it is very important to replace traditional refrigerant by new green refrigerant that is not harmful to ozone layer.

(73) You don't know how to fix the holes in our ozone layer.

(74) It may disrupt the ozone layer and lead to global greenhouse effect.

(75) Some raise their eyes heavenwards, launching weekly balloons to probe the ozone layer, watching with wonder the northern lights higher still.

(76) Carbon tetrachloride is a chemical destroying the ozone layer, and its use should be decreased gradually.

(77) With the ozone layer absorbing harmful ultraviolet radiation, life colonized the surface of Earth.

(78) Pollution leads to depletion of ozone layer, global warming and climate change.

(79) The protective ozone layer above the Earth has been thinned.

(80) Because the toxicity of tetrachloromethane would destroy certain human and animal liver, and damage the ozone layer.

(81) Mars has no ozone layer to screen out the Sun's lethal radiation.

(82) The ozone layer protects living things from harmful radiation of the ultra - violet ray from the sun.

(83) Please shut up! All that hot air is damaging the Ozone Layer.

(84) The ozone layer blocks some harmful rays which the sun gives off.

(85) The ozone layer protects Earth from dangerous radiation from the sun.

(86) Climate change and the depleted ozone layer are among the starkest examples.

(87) Scientists have called for stricter controls on emissions of laughing gas, after discovering the common chemical poses a new threat to the recovering ozone layer.