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In 2002 A.D. according to research the c...

In 2002 A.D. according to research the concentration of CFC reached to

A

368 ppm

B

1750 ppb

C

261 ppm

D

326 ppb

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about the concentration of chlorofluorocarbons (CFCs) in the year 2002 AD. 2. **Background Information**: CFCs are man-made compounds that were widely used in refrigeration, air conditioning, and aerosol propellants. They are known to deplete the ozone layer. 3. **Research Findings**: According to research conducted in 2002, the concentration of CFCs in the atmosphere was measured. 4. **Concentration Value**: The research indicated that the concentration of CFCs reached 261.5 million parts per billion (ppb) in the atmosphere. 5. **Conclusion**: Therefore, the answer to the question is that the concentration of CFCs in 2002 AD was 261.5 million ppb. ### Final Answer: In 2002 AD, the concentration of CFC reached 261.5 million ppb. ---
### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about the concentration of chlorofluorocarbons (CFCs) in the year 2002 AD. 2. **Background Information**: CFCs are man-made compounds that were widely used in refrigeration, air conditioning, and aerosol propellants. They are known to deplete the ozone layer. 3. **Research Findings**: According to research conducted in 2002, the concentration of CFCs in the atmosphere was measured. ...
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