The glow of combustibles oxidizing without any heat a all.

A campfire is a fire at a campsite that provides light and warmth, and heat for cooking. It can also serve as a beacon, and an insect and predator deterrent.[from wikipedia]

The most common direct human causes of wildfire ignition include arson, discarded cigarettes, power-lines arcs (as detected by arc mapping), and sparks from equipment. Ignition of wildland fires via contact with hot rifle-bullet fragments is also possible under the right conditions. Wildfires can also be started in communities experiencing shifting cultivation, where land is cleared quickly and farmed until the soil loses fertility, and slash and burn clearing.[from wikipedia]

Not one tree was cut down to make our Pres-to-Logs fire logs, bricks or pellets. Manufactured from 100% recycled, natural biomass material acquired from the lumbar industry, the production of our wood products dramatically reduces the amount of sawdust waste sent to landfills. They also burn 80% cleaner than cordwood, releasing virtually no emissions into the air.[from lignetics.com]

Propane gas has become a popular choice for barbecues and portable stoves because its low boiling point makes it vaporize as soon as it is released from its pressurized container. [from wikipedia]

Something which is very poorly done; a mess.[from wiktionary]