The Four Corners area is the major U.S. hot spot for methane emissions in this map showing how much emissions varied from average background concentrations between 2003 and 2009. Dark colors are lower than average, while lighter colors are higher. (NASA/JPL-Caltech/University of Michigan)

The Four Corners area is the major U.S. hot spot for methane emissions in this map showing how much emissions varied from average background concentrations between 2003 and 2009. Dark colors are lower than average, while lighter colors are higher. (NASA/JPL-Caltech/University of Michigan)

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