This Lawns began to appear in city parks and on affluent properties after the Civil War in the 1870s. Lawn mowers and sprinkler technology helped lawns come of age in northern Europe and the United States. Lawns can be made of material other than grass such as the use of plants that include wildflowers, ground covers, low growing herbs and sedges that can all be walked on. Lawns are an important element when it comes to the fight against urban heat as well as providing a number of benefits to the environment. Some of these benefits include oxygen conversion, erosion control, air particle filtering, a place for enjoyment and recreation as well as a surface for air cooling to offset the heat from cement, asphalt and rooftops. -173 Notes: Other includes industrial waste and non-renewable municipal waste. Emissions shown above are the sum of emissions from main activity producer electricity generation, combined heat and power generation, and heat plants. Main activity producers formerly known as public utilities are defined as those undertakings whose primary activity is to supply the public. They may be publicly or privately owned. Emissions from own on-site use of fuel are included. This corresponds to IPCC Source/Sink Category 1 A 1 a. "electricity cost ontario " and "home energy use survey " (include "home energy audit uk", "home made wind tunnels ", "home energy efficiency software ", "maritime and northeast pipeline ", "cost to build wind turbine ", "How does solar cell works ", 12 Nov 2008 Pingback by Energy Crisis Information » Is There A Green/Energy Connection with Soro=92s Goldman Sachs and … on November 12, 2008 9:40 pm & Home hydro electricity )