Researchers at NASA's Goddard Space Flight Centre have shown that worldwide emissions of carbon tetrachloride (CCl4), a chlorofluorocarbon that destroys ozone, average to 39 kilotons per year despite the Montreal Treaty, designed to phase out the use of these gasses.
As of 2008, CCl4 accounted for about 11 percent of chlorine available for ozone depletion, which is not enough to alter the decreasing trend of ozone-depleting substances. Still, scientists and regulators want to know the source of the unexplained emissions.
For almost a decade, scientists have debated why the observed levels of CCl4 in the atmosphere have declined slower than expectations, which are based on what is known about how the compound is destroyed by solar radiation and other natural processes.
"Is there a physical CCl4 loss process we don't understand, or are there emission sources that go unreported or are not identified?" [Qing Liang, an atmospheric scientist ] said.
|"There is no hope of saving the global coral reef ecosystem." A World Without Coral Reefs|
|“Improve on the ability of plants to suck carbon dioxide out of the atmosphere.”|
|"Fossil fuel executives want to get a piece of the clean-energy business."|
|Keep an Eye on Irene With New York Times' Beautiful Hurricane Tracker|
|We're Running Out of Sand|
|“We estimate the dynamical lifetime of the Tesla to be a few tens of millions of years.”|
|“There are over a billion people who have no access to energy what-so-ever.”|
|The 24 Carrot Cake|
|“How do you communicate wirelessly with WiFi using only plastic?”|
|Japanese Robot Serves Ice Cream From Inside a Vending Machine|
|“Facebook is a declining power.”|
|CaptchaTweet: Write Tweets in Captcha Form|
|The (Very Scary) People of Public Transit|
|How to Avoid Jury Duty|
|“What happens when anyone can make it appear as if anything has happened, regardless of whether or not it did?"|
|“We are considering public transport free of charge in order to reduce the number of private cars.”|
|"What if plant cells could be grown for food by regular people."|