NASA Sees Definitive Evidence of the Montreal Protocol's Success

The video discusses the impact of ozone-depleting substances, particularly chlorofluorocarbons (CFCs), on the ozone layer. It highlights the success of the Montreal Protocol in reducing these substances at the Earth's surface. The video explains how chlorine from CFCs destroys ozone in the stratosphere and presents new findings showing a decline in chlorine levels inside the Antarctic ozone hole. This decline is linked to a reduction in ozone depletion, as observed through NASA's microwave limb sounder data. The study confirms that the ozone hole is recovering, with ozone levels responding to the decrease in chlorine.

What was the primary purpose of the Montreal Protocol?

• To measure ozone levels in the stratosphere

• To monitor global temperature changes

• To regulate and reduce ozone-depleting substances

• To increase the production of ozone-depleting substances

How do chlorofluorocarbons contribute to ozone depletion?

• By absorbing ultraviolet radiation

• By increasing atmospheric carbon dioxide levels

• By releasing nitrogen into the atmosphere

• By releasing chlorine that breaks down ozone

What evidence suggests that the Antarctic ozone hole is recovering?

• Increasing levels of hydrogen chloride

• Decreasing levels of reactive chlorine

• Rising global temperatures

• Higher levels of carbon dioxide

What factor can cause variations in ozone levels besides chemical changes?

• Solar activity

• Ocean currents

• Temperature fluctuations

• Wind patterns

What instrument provided data for studying ozone changes?

• Hubble Space Telescope

• Voyager Probe

• Microwave Limb Sounder

• Lunar Reconnaissance Orbiter