Global surface temperatures rose nearly 1of from 1965 to 1998 just as chlorine from manufactured cfc gases depleted the ozone layer similarly throughout earth history effusive basaltic volcanic eruptions have emitted large quantities of chlorine and bromine depleting the ozone layer and raising temperatures. Ultraviolet b radiation causes sunburn while no amount of infrared radiation over any length of time can cause sunburn ozone depletion and related warming began to increase around 1970 as humans began manufacturing more and more chlorofluorocarbon gases used as refrigerants solvents and foam blowing agents. In the 1980s many leading scientists were convinced that greenhouse gases were the cause of global warming that earth was in danger of overheating during the 21 st century as emissions of greenhouse gases increase and that scientists must demonstrate consensus in order to convince political leaders to take the expensive steps necessary to . Geophysicist dr peter l ward author of what really causes global warming greenhouse gases or ozone depletion scientifically challenges the current model of what we believe about global warming. Human activities cause ozone depletion and global warming ozone o 3 depletion does not cause global warming but both of these environmental problems have a common cause human activities that release pollutants into the atmosphere altering it global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal oil and natural gas are burned to generate
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