A hot topic at this meet-up of solid-waste execs will be the booming business of trash to cash. Some 55% of American waste still ends up in landfills, and operators in this $52 billion industry have long been required to collect and dispose of the by-product, methane gas. Well, waste not, want not: In 2003, some began turning it into energy. There are now 469 landfill-to-gas projects in the U.S., delivering 310 million cubic meters of gas daily -- enough to power 1.6 million homes. How wonderfully trashy. --Kate Rockwood

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