Susan Solomon

“the first signs of ozone depletion actually appeared as early as 1957.”

“though it took another 30 years for scientists to develop the atmospheric monitoring capabilities that led them to discover the hole”

“The ozone layer sits in the stratosphere between 7 and 31 miles (11 and 50 kilometers) above Earth’s surface.”

“By 1984, the ozone layer over Halley was only two-thirds as thick as it had been in earlier decades.”

“over Antarctica at the beginning of Southern Hemisphere spring (August through October).”

“carbon tetrachloride use was banned from consumer products in the 1970s due to health concerns, then further restricted by the Montreal Protocol in 1990.”

“the first signs of ozone depletion actually appeared as early as 1957.”

“It took another 30 years for scientists to develop the atmospheric monitoring capabilities that led them to discover the hole.”

“By 1984, the ozone layer over Halley was only two-thirds as thick as it had been in earlier decades.”

“over the past 76 years, finding that the earliest sign of ozone depletion would have been detectable over the tropics by 1957.”

“carbon tetrachloride use was banned from consumer products in the 1970s due to health concerns, then further restricted by the Montreal Protocol in 1990.”