The fourth annual Green California Summit and Exhibition wrapped up today at the Sacramento Convention Center, giving attendees a look at new green technology that provided a glimpse into what the world could look like in the near future.

The summit featured keynote presentations from four speakers: 15-year-old Alec Loorz, founder of Kids vs. Global Warming; Noel Perry, Next 10 founder; David Roland-Holst, director of the University of California at Berkeley's Center for Energy, Resources and Economic Sustainability; and Fran Pavley, the state senator who authored Assembly Bill 32, the Global Warming Solutions Act of 2006. The summit also offered classes on green building codes, new media and green legislation.

Between classes, people could walk through the expansive and busy exhibition hall, which was filled with about 300 booths and showed everything from commercial toiletry management to fuel-cell-powered vehicles.

Japanese company Noritz showed off a gas-powered, tank-less water heater that promised endless hot water and used less energy than current water heaters, while BionX had a device that provided electronic assistance to bicycles, resulting in a faster and more efficient bike ride.

Groasis featured its Waterboxx invention, a little box that allows for planting trees in places that they would not normally grow. The device, which will be fairly cheap when it is released, gives enough water to a young tree to live until its roots can begin to sustain its life. Ellie Hoff, project director at Groasis, said that a test in the Sahara desert showed that more than 80 percent of trees planted with the Waterboxx technology survived, while more than 90 percent of those planted without the device died. Hoff said this can lead to more planting of trees.

"At this moment, when you plant something, you have to irrigate it," she said. "But if there is a drought or scarce water resources, this product reduces the amount of water needed to plant trees."

Mount Professional Services showcased its Dewpointe water filter, which uses a complex system to make water out of the moisture in the air, producing up to 3,000 gallons per day of clean water without the need for a pure water source. Scott Mount of Mount Professional Services said that this technology could be used to provide water to people who do not normally have access to it.

"In America, we take for granted the water resources we have," he said. "We're looking at going to places that need water. This device could be used in places like Haiti or Chile."

Not all of the booths promoting a green lifestyle needed high-tech products. 7th Generation Recycling showed its textile recycling bins, which would help eliminate landfill waste and provide a use for used clothing that places like the Salvation Army can not take.

"We're trying to put these bins in convenient public places," said owner Kennedy Nijmeh. "It provides an outlet for people to get rid of their unwanted textiles." Nijmeh said that the unusable textiles are processed and made into things like mop heads and insulation, while some clothing that can still be used is sent to other countries.

The exhibit hall featured other products including solar-powered trash compactors, a machine that makes biodiesel fuel out of vegetable oil for less than $1 per gallon, electric motorcycles and a specialized fan that decreases the amount of grease a restaurant oven produces. Many different industries, from clothing to computers and lighting, were represented, each with its own take on how to make the planet greener and more efficient.

The fourth annual Green California Summit and Exhibition turned the Sacramento Convention Center exhibition hall into a window to tomorrow's world.