Down to Earth All Vegitarian Organic and Natural will celebrate Earth Day with a 30 percent off sale and a switch to biodegradable checkout shopping bags.

The sale, which applies to more than 50 items in stock, will run from 8 a.m. to 10 p.m. Wednesday at all four Down to Earth stores: Honolulu, Kailua, and Pearlridge on Oahu and Kahului on Maui.

Down to Earth says its new biodegradable bags will break down into water, carbon dioxide, and harmless humus on land and in the ocean, and leave no toxins behind.

Biodegradation takes place with or without the presence of light or oxygen. It works on bags buried in the ground or disposed in compost bins or landfills, which normally prevent degradation because they become air tight. The bags take 9 months to 5 years to biodegrade.