Diesel emits lower levels of some greenhouse gases Many inaccurate claims are broadly applied to the benefits of liquefied propane and compressed natural gas fuels. While those fuels do have some clean burning properties, certification results from the California Air Resources Board (CARB) indicate that LP-fueled engines emit dramatically higher levels of oxides of nitrogen (NOx) and carbon monoxide (CO) than comparable diesel engines. Many of the arguments leveled against diesel emissions in the past have been nullified with the removal of sulfur and other impurities from the diesel fuel stock. The Environmental Protection Agency states "the reductions in NOx and particulate matter from non-road diesel engines, similar to those technologies used in highway diesel trucks and buses, will provide enormous public health benefits." Today, the cleaner, economical alternative for the landscape professional is a diesel-powered Grasshopper product.  The table below illustrates sample 2008 emissions results from CARB certifications: The diesel engine represented in the above chart is used in Grasshopper equipment and though it is larger and more powerful than the closest comparable gasoline models, it emits less non-methane hydrocarbon, less oxides of nitrogen, and less carbon monoxide than the smaller gasoline and LP engines. NOx represents a source of greenhouse gas, and carbon monoxide is a deadly, odorless gas. Request more information about Grasshopper diesel mowers