Context: Since the 1970s, an important focus of study has been the ozone layer in the atmosphere above Antarctica. In 1985, three British scientists working on data they had gathered at Halley Station on the Brunt Ice Shelf discovered the existence of a hole in this layer. It was eventually determined that the destruction of the ozone was caused by chlorofluorocarbons (CFCs) emitted by human products. With the ban of CFCs in the Montreal Protocol of 1989, climate projections indicate that the ozone layer will return to 1980 levels between 2050 and 2070.

Question: What has been an important atmospheric study since the 1970s?
Answer: ozone layer

Question: Where in Antarctica is Halley Station?
Answer: Brunt Ice Shelf

Question: When did scientists discover the hole in the ozone layer?
Answer: 1985

Question: What chemical was discovered to have caused the hole in the ozone?
Answer: chlorofluorocarbons

Question: What agreement banned the use of CFC s?
Answer: Montreal Protocol

Question: What was studied in 1970?
Answer: Unanswerable

Question: What was discovered in 1985 in the ozone at the Brunt Station on the Halley Ice Shelf?
Answer: Unanswerable

Question: What does CCF stand for?
Answer: Unanswerable

Question: What were banned in 1998?
Answer: Unanswerable

Question: What will happen to the ozone by 2050?
Answer: Unanswerable