The compound responsible for the depletion of the ozone layer in the upper strata of the atmosphere is:

1. Ferrocene

2. Fullerenes

3. Freons

4. Polyhalogens

Which one of the following pairs is mismatched:

1. Nuclear power – radioactive wastes

2. Solar energy – greenhouse effect

3. Fossil fuel burning – release of CO₂

4. Biomass burning – release of CO₂