How Studying Venus Saved Earth

In 1928, chemists invented chlorofluorocarbons (CFCs), which became widely used by the 1970s. However, in 1974, scientists discovered that CFCs were depleting the ozone layer, crucial for blocking harmful UV radiation. This discovery was linked to research on Venus's atmosphere. Despite initial skepticism, evidence of ozone depletion led to global action to reduce CFC production. Molina and Rowland, who made the groundbreaking discovery, were awarded the Nobel Prize in 1995. International agreements have since curbed CFC use, and the ozone layer is showing signs of recovery.

What were the key properties of CFCs that made them popular in the 1970s?

• They were only used in refrigeration.

• They were non-toxic, fireproof, and versatile.

• They were highly reactive and easy to break down.

• They were expensive and difficult to produce.

What was the initial assumption about CFCs when they were released into the atmosphere?

• They would react with other atmospheric gases.

• They would remain inert and not cause any problems.

• They would enhance the ozone layer.

• They would quickly decompose.

How did scientists studying Venus contribute to understanding CFCs' impact on Earth?

• They proved that CFCs were beneficial for the ozone layer.

• They discovered a new type of CFC.

• They found that UV light could break down CFCs, releasing chlorine.

• They identified a new ozone layer on Venus.

What significant discovery was made in 1985 regarding the ozone layer?

• The ozone layer was found to be thicker than expected.

• CFCs were found to be harmless.

• A new type of CFC was found.

• A hole in the ozone layer above Antarctica was discovered.

What was the outcome of the international agreements regarding CFCs?

• No significant changes were made.

• CFC production increased globally.

• CFC production was largely stopped worldwide.

• CFCs were replaced with more harmful substances.