Charcoal grilling is still the most popular method of outdoor cooking, except in the United States where gas grills are number one. What tastes best, food cooked on charcoal or gas? There is quite a raging debate. But what is the greenest method of grilling?Gas grills, most charcoal, and lighter fluid, are made with petroleum, a non-renewable resource that is neurotoxic and causes toxic air pollution. You can avoid petroleum completely if you use a metal charcoal chimney with wood brickets.With charcoal metal chimneys you fill the cylinder with charcoal, scrunch newspaper under the charcoal in the special housing for this purpose, and then light the newspaper to heat up the coals. Once the coals are red hot you turn over the cylinder and pour the coals into the bed of the grill.You can buy a charcoal chimney for under $20 at most hardware stores, and reuse it for years. All you need to light the charcoal are some old newspapers and matches.Of course, a solar cooker is more eco-friendly than any sort of grilling or electricity-based cooking. Even grilling with wood charcoals causes pollution.Last but certainly not least, choose all organic food for grilling.