A worker positioned along a long chute manually picks out rocks and debris from chunks of coal as they move down the line.
Keywords
men at work,
long,
chute,
manually,
rock,
debris,
chunk,
coal,
line,
natural,
resource,
manual,
labor,
mining,
extraction,
pollution,
industrial,
factory,
consumption,
energy,
environment,
industry,
technology,
electric,
plant,
electricity,
ecology,
gasoline,
fossil