air pollution
architecture
architecture and buildings
back lit
blue
brown coal
building
carbon dioxide
chimney
china
climate
climate conservation
coal
color image
cooling tower
electricity
energy
environment
factory
finance
fuel and power generation
global warming
growth
ice
industry
kyoto accord
outline
people
pollution
power
power station
residential
silhouette
skating
sky
smoke
smoke pipe
smoke stack
snow
winter