What was the environmental drawback of the earlier recovery method?

• A. It required extremely high temperatures
• B. It used solvents
• C. It generated minimal emissions
• D. It relied on renewable energy

Answer: (A)

High energy demand drives the environmental impact here. Pushing a process to extremely high temperatures requires a lot of heat, which almost always comes from burning fuels. That means more energy consumption and higher greenhouse gas emissions, plus potential air pollution and wasted heat. In contrast, the other options describe either potential benefits (minimal emissions, renewable energy) or issues not tied to the old method’s main drawback (solvent use would be a different kind of problem). So the environmental draw of the earlier recovery method is its energy intensity and the associated emissions, making extremely high temperatures the best answer.