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Pollution in Mexico City (DI01469)
Pollution in Mexico City (DI01468)
Pollution over Denver, Colorado (DI00396)
Pollution in Mexico City (DI01466)
Methane research:  forest burning (DI00039) Photo by Patrick Zimmerman
Pollution: agricultural (DI00046)
Factory smoke oil refinery, Roosevelt, Colorado (DI00418), Photo by Carlye Calvin
Pollution in Mexico City (DI01467)
Smoke from wildfire (DI01568)
Cloud formation from steam released by industrial plants (DI00399)
Industrial pollution (DI00404)

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