Activities for children and adults are expected to fill Santa Monicaís Third Street Promenade from 10 a.m. to 7 p.m. Saturday, April 14th, in honor of the 37th Earth Day.

The Promenade, between Broadway and Wilshire Boulevard, will be transformed into a free ìEcoFestî with 70 exhibits.

ìKid-friendlyî exhibits include STAR ECO-Stationís and Childrenís Nature Instituteís wild animals, Heal the Bay, Ballona Wetlands, Surfriders and TreePeopleís nature exhibits, Enviro-Nate Walking Earth, the Tide Pool Cruiser, and sea lion puppet-making with Marine Mammal Care.

Youngsters will also have a chance to sit in the driverís seat of a Santa Monica Big Blue Bus powered by natural gas.

A Sustainable Transport Village will include displays of alternative fuel vehicles, including Toyota Prius, Camry and Highlander Hybrids, an RAV4 electric SUV, electric bikes and scooters, and a preview of the bio-diesel Smart Car, said to be one of the most fuel-efficient cars available, getting up to 85 miles per gallon.

Environmental Motors, based in Southern California, is scheduled to offer test drives of the Zap, Zenn and Miles neighborhood electric vehicles, as well as raffle off an electric motor scooter.

ìWe are pleased to bring so many family-oriented exhibits to Earth Day, because kids can encourage parents to buy environmentally friendly products, which reduces pollution and global warming, making a healthier future for all of us,î said director Jim Stewart.

ìEarth Day helps people learn about environmental solutions already in the marketplace and learn effective ways to take action,î he added.

Stewart says the public can see how they can become ìcarbon neutralî and not contribute to global warming at www.Carbon

Groups expected to perform live on the ìsolar-powered stageî include The Vegan Vixens, Stephen Longfellow Fiske Band, The Luminaries, The Superbroke Brass & Tin & Strings Marching Band Ensemble, Red Velvet, Nianna, Corey Leland, Naked Americans & ADM and Catalog.

State Assemblymembers Mike Feuer and Julia Brownley and Santa Monica City Councilmember Kevin McKeown are also expected to speak.

ìBillionaires For Bushî will provide what are described as ìcampy, satirical songs and environmental street theater featuring the big-footprint Carbon Man.î

An estimated 15,000 people are expected to join the carbon-neutral event on the Promenade to see solar energy systems, environmentally responsible investing, organic gardening, hemp and organic cotton clothing displays.

This event is one of over a thousand Step It Up events taking place nationwide on April 14th, according to organizers.

Step It Up 2007 supports national policy to reduce greenhouse gas emissions 80 percent below 1990 levels by 2050 to avert the catastrophic effects of global warming. Information,

Sponsors of Earth Day include HSBC (which claims to be the worldís first major bank to go carbon-neutral), NBC4 television, Toyota Prius and Camry Hybrids, EnVironmental Motors, City of Santa Monica, Whole Life Times, Santa Monica Mirror, KPFK 90.7 FM, LA Weekly, YogaMates, Enlightenment Card, Topanga Magazine and Los Angeles Free Press.

The event is organized by Earth Day Los Angeles, a project of the nonprofit International Humanities Center.

For information on the local event or to volunteer, www.Earth or (888) 295-8372.