Read the passage below carefully and match each excerpted statement (1–4) on the left with its correct summary role (A–D) on the right.
In recent years, the exponential growth of electronic waste in West African urban hubs has prompted a shift toward urban mining—the extraction of precious metals and rare earth elements from discarded electronics. While traditional disposal methods contribute heavily to groundwater contamination through heavy metal leaching, modern electrochemical recycling offers a lucrative and environmentally sound alternative. For instance, specialized micro-processing plants in Lagos have successfully recovered over eighty percent of copper and gold from circuit boards discarded in Computer Village. Furthermore, these recycling facilities utilize low-energy hydrometallurgical leaching techniques imported from Germany, which significantly cut operational costs. Beyond local environmental remediation, recovering these critical minerals reduces reliance on resource-intensive mining, stabilizing global supply chains for green technology components. Therefore, establishing regulated urban mining infrastructure is essential for mitigating environmental degradation while securing vital materials for sustainable industrial growth.
- Establishing regulated urban mining infrastructure is essential for mitigating environmental degradation while securing vital materials for sustainable industrial growth.Central thesis outlining the primary argument and ultimate recommendation of the passage.
- Specialized micro-processing plants in Lagos have successfully recovered over eighty percent of copper and gold from discarded circuit boards.Empirical example supporting the practical feasibility of metal recovery in urban areas.
- Recycling facilities utilize low-energy hydrometallurgical leaching techniques imported from Germany to reduce operational costs.Non-essential technical detail regarding specific equipment and operational procedures.
- Traditional electronic waste disposal methods contribute heavily to groundwater contamination through heavy metal leaching.Background context describing the environmental problem that urban mining addresses.