The environmental costs of technological development can include:
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More waste in landfills: As technology advances, new devices and gadgets often lead to increased electronic waste that can end up in landfills.
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Loss of forest and water resources: The production of technology can lead to deforestation and depletion of water resources, especially in areas where raw materials are extracted.
The other options you listed can be viewed through different lenses but are not directly tied to environmental costs:
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Increased recycling of heavy metals: This is generally a positive outcome of technological development aimed at reducing environmental impact, not a cost.
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Less face-to-face communication: This is a social change rather than an environmental cost.
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Reduction in greenhouse gas emissions: Similar to recycling, this is a potential benefit of certain technological advancements, such as renewable energy technologies, rather than a cost.
Therefore, the two correct examples of environmental costs from your list are more waste in landfills and loss of forest and water resources.