Concept:Improving the atmosphere means reducing pollutants and increasing gases like oxygen, usually through restoring vegetation.
Explanation:Cutting down trees reduces oxygen and increases carbon dioxide, so it does not improve the atmosphere.
Mining and construction work release dust and harmful gases into the air.
The general use of chemicals often adds pollutants to the atmosphere rather than cleaning it.
Land reclamation involves restoring degraded land, often by replanting grasses and trees.
The restored plants absorb carbon dioxide and release oxygen during photosynthesis.
This helps to create a better balance in the composition of the atmosphere.
Answer:B. Land reclamation