Epic Meteor Adventure and Ozone Mystery

A meteorite hit a roof in Novato, CA, and its journey was traced back to the asteroid belt. The meteorite's composition suggests it is from an L chondrite, possibly linked to the moon's formation. Meanwhile, NOAA discovered ongoing emissions of carbon tetrachloride, a banned CFC, raising concerns about ozone depletion and climate change.

What was discovered about carbon tetrachloride by the National Oceanic and Atmospheric Administration?

What are the potential sources of carbon tetrachloride emissions mentioned in the text?