Factory, Refinery, "North America", "aerial photography", "global warming", canada, chemical, chimneys, commerce, demand, economy, energy, environment, gas, global, industrial, industry, market, oil, petrochemical, petroleum, plant, pollution, reservoirs, stacks, technology, transportation, supply, flue, marketplace, lipid, district, application, impurity, fossil fuel, reservoir, conduit, molecule, profession, transaction, environmental condition, engineering, north american country, fuel, passage, chimney, macromolecule