Methane plays many important roles in the earth's environment. It is a
potent "greenhouse gas" that warms the earth; controls the oxidizing
capacity of the atmosphere (OH) indirectly affecting the cycles and
abundances of many atmospheric trace gases; provides water vapor to the
stratosphere; scavenges chlorine atoms from the stratosphere,
terminating the catalytic ozone destruction by chlorine atoms, including
the chlorine released from the man-made chlorofluorocarbons; produces
ozone, CO, and CO2 in the troposphere; and it is an index of life on
earth and so is present in greater quantities during warm interglacial
epochs and dwindles to low levels during the cold of ice ages. By all
measures, methane is the second only to CO2 in causing future global
warming. The book presents a comprehensive account of the current
understanding of atmospheric methane, and it is an end point for
summarizing more than a decade of intensive research on the global
sources, sinks, concentrations, and environmental role of methane.