Warming enhances emissions of Volatile Organic Compounds (VOC) (which increase by 20–30% per degree Celsius) (Guenther et al. 2000), CH4, and N gases, which generally tend to increase troposphere ozone. Changes in OH concentration further affect the variability in concentration of some atmospheric compounds such as CH4. Effects of interannual variability on biogenic sources and sinks are one of a number of processes that affect CH4 and tropospheric ozone (Warwick et al. 2002). Enhanced biomass associated with the La Nina phase of the El Nino-Southern Oscillation, followed by droughts in the El Nino phase, produce above average biomass burning emissions from savannas in southern Africa (Swap et al. 2003). In 1997–98, fires associated with an exceptional drought caused by ENSO devastated large areas of tropical rain forests worldwide (Siegert et al. 2001). Emissions of associated gases such as CO2, CO, CH4 and other trace gases have been correlated with large biomass burning events in tropical and boreal regions (Langenfelds et al. 2002)