Many recyclers do not recycle e-waste responsibly. It provides recommendations for consumer recycling and a list of recyclers judged environmentally responsible. Pyrolysis plants can recycle many hard to decomposed materials that normal recyclers cannot. These items are then handed over to certified recyclers in the U.S. for proper recycling. It has been signed by numerous recyclers promising to recycle responsibly. Exide is one of the world's largest producers, distributors and recyclers of lead-acid batteries. As mycorrhizal symbionts, and as decomposers and recyclers, fungi are essential for sustainability of forests. Customers are encouraged to choose certified electronics recyclers. This Zabbaleen community later emerged as the informal garbage collectors and recyclers of Cairo. Other materials were purchased from timber recyclers and secondhand traders. The Association of Plastics Recyclers has issued a "Design Guide for Recyclability". It encourages the shared approach of collection points for consumers and recyclers to meet. Two certifications for electronic recyclers currently exist and are endorsed by the EPA. It once was one of the largest recyclers of iron and steel in southern Ontario. They were dismantled, and the steel sent to recyclers.