CFC's are long-lasting chemical substances that can rise high up into the stratosphere, where they are broken apart by radiation from the sun. Since then, the ozone layer has clearly recovered, marking a great success - one of the few but highly commendable episodes where almost all the world's countries chose to set aside their differences and work for the common good of the planet and all life that call it home. This releases chlorine atoms that destroy ozone gas - a form of oxygen.
Strahan's study is the first to look directly at measurements of chemicals to argue that the shrinking hole stems from the ban of CFCs.
Using a special instrument designed by scientists at NASA's Jet Propulsion Laboratory in California, the agency's Aura satellite has measured declines in the concentration of ozone-killing chlorine. Stratospheric ozone protects life on the planet by absorbing potentially harmful ultraviolet radiation that can cause skin cancer and cataracts, suppress immune systems and damage plant life. The latest research - published this week in the journal Geophysical Research Letters - suggests the ban is working. By measuring hydrochloric acid levels each fall, scientists were able to gauge the amounts of chlorine in the ozone hole. Comparing hydrochloric acid levels with nitrous oxide levels-another gas that remains in the atmosphere-they determined chlorine's decline of 0.8 percent per year. This resulted in a 20-per cent drop in ozone destruction, it said.
"This is very close to what our model predicts we should see for this amount of chlorine decline", Strahan said. Now, Strahan and colleagues report not only the first direct measurements that prove ozone depletion is decreasing but also that the decrease is caused by fewer CFCs in the atmosphere. "But we're not yet seeing a clear decrease in the size of the ozone hole because that's controlled mainly by temperature after mid-September, which varies a lot from year to year".
LeBron James scored Cleveland's first two buckets of the night - one to put the Cavs up, 2-0, the second to give them a 4-2 lead. The next time they see their former teammate, he probably won't be in a hoodie after watching the game from the bench.
Kansas City Chiefs cornerback Phillip Gaines was placed on injured reserve with a dislocated elbow, the team announced Wednesday. Tennessee will be in Kansas City for the first game of the weekend, which gets underway at 4:35 p.m.
Keith Knudsen with the USGS in Menlo Park said there hadn't been a major quake on the Hayward fault in over 100 years. Did you feel it where you live? The natural disaster was centered below Berkeley, California.
The two managers hit the headlines after failing to shake hands in November after Chelsea beat United 1-0 at Stamford Bridge. He was given a ten-month ban, later reduced to four, before being acquitted of the charges.
The Justice Department and attorneys for Steele did not immediately respond to CNN's request for comment. Maybe there is some innocent explanation for the inconsistencies we have seen, but it seems unlikely.
According to previous reports, the Fargo Gander Mountain location was closed due to an uncooperative landlord. Individuals interested in applying for a position with Gander Outdoors for more information.
USA media outlets including the New York Times in recent years have scrutinised the Clinton Foundation. Numerous allegations were detailed in conservative author Peter Schweizer's 2015 book Clinton Cash.
The Supreme fries are a bit more hard to eat, as the toppings overload can turn the crisp fries nonfunctional and soggy. Grab them while you can! The Nacho Fries were tested in West Virginia and Bakersfield, California previous year .
In fact, LG says this one will be able to handle "express check-in and check-out services", which sounds pretty cool. The three join the airport guide robot and airport cleaning robot revealed previous year .
She also appeared to use another offensive word to describe Trump, but that word was bleeped out of the broadcast. And the Emmy-winning Nolan, who joined ESPN from rival Fox Sports three months ago, was clearly having fun.
Hip-hop beats rock to become America's favorite music genre
It's probably no surprise which song topped 1 billion streams: "Despacito" by Luis Fonsi and Daddy Yankee (1.1 billion streams). Meanwhile, Drake is the most-streamed artist for the second consecutive year in a row with a whopping 6 billion streams.
Mad Catz Returns from the Dead
More details regarding these new peripherals will be unveiled by the company at CES 2018, which runs from January 9 through 12. The new owners reportedly worked for Mad Catz prior to the company's bankruptcy filings and effectively closed down.
China boosts trade restrictions on North Korea
President Donald Trump had tweeted that he was "very disappointed" that China is allowing oil to go into North Korea. However, many Taiwanese businesses are believed to have developed deep commercial ties with North Korea.
City's unemployment rate 5.9 per cent in December
Saskatchewan had its first noticeable employment increase in 10 months as almost 5,000 jobs were added to the economy in December. Red Deer region's unemployment rate is the lowest among Alberta's seven regions and well below the province's 6.9 per cent.