OTOH our garbage and wreckage will provide a lot of resources. For example there may not be any easily accessible copper deposits, but there are a lot of wires

OTOH our garbage and wreckage will provide a lot of resources. For example there may not be any easily accessible copper deposits, but there are a lot of wires to scavenge. No easily accessible fossil fuels, but the amount of plastic in garbage dumps makes them a fossil fuel source.