Current GK

The largest greenhouse gas leakage in the US history took place in February 2016. The gas was:

  1. Carbon dioxide
  2. Methane
  3. Chlorofluorocarbon
  4. Nitrous oxide


The 112-day leak at the Aliso Canyon Oil Field released about 5 billion cubic feet of methane into the atmosphere. The methane emissions from the leak, caused by a ruptured pipe, doubled the methane emissions of the entire Los Angeles metropolitan area, creating enough pollution to match the annual output of nearly 600,000 cars.

The Aliso Canyon facility, one of the largest underground reservoirs of natural gas in the US, is owned by the Southern California Gas Company, which is a division of Sempra Energy.

The correct option is B.