Every body  knows that trash pollution is a  great problem when it is outside a landfill . But as Carmichael Roberts reminds us, it is just as big a problem inside Solid waste landfills are one of the largest producers of methane emissions in the U.S which are far more potent than carbon dioxide as a greenhouse gas.  During garbage disappear and it turn  into clean for renewable energy. Sierra Energy’s almost unbelievable technology is called Fast Ox. Here is  explain that how it works. Trash is brought into a blast furnace based gasifier and i tis heated to 4,000°F using oxygen and steam and then synthesis gas (hydrogen and carbon monoxide), non-leaching stone and molten metal is produced.