city, sun, clouds
power station, smog, industry
pollution, factory, river
earth, globe, protection
factory, chimney, smoke
contaminated, water, glass
earth, globe, protection
environmental, pollution, environment
ink, water, paint
air pollution, smoke, environment
dock, cable innovator, air pollution
fishing nets, networks, fishing
pollution, rubbish, waste
tire, rubber, pollution
heavy water factory, chemical disaster exercise, calamity
concepts, garbage, pollution
