Incense burning emits several components similar to cigarette smoke and even exerts a higher genotoxicity on eukaryotic cells than tobacco smoke [ 36].
Industrial processes such as small-scale gold mining and coal burning emit mercury into the atmosphere.
Biomass burning emits greenhouse gases, and is how America is legally burning its carbon-storing forests: turning them into wood pellets and exporting them to European fireplaces.
Biomass burning emits large amounts of carbon and particulate matter (PM).
A burning church emitted a thick plume of white smoke.
Biomass energy from growing and burning plants emits no net carbon dioxide (carbon in the plant comes from carbon dioxide in the atmosphere), but will be limited by the availability of water for growing crops.
More radical technological changes are needed.Ethanol is one possibility, because although burning it emits CO2, growing the crops needed to produce it absorbs the stuff, at least in theory.
The 17th-century phlogiston theory, whereby burning substances emit an invisible, weightless substance called phlogiston, was superseded by the views of the French chemist Antoine-Laurent Lavoisier, who proposed his oxygen theory from 1775.
Taking wing from Brussels without burning fuel, emitting noise or trailing pollution, the experimental plane arrived at Le Bourget airport, north of Paris, last week — although it took nearly 16 hours for the craft, the guest of honor at Paris Air Show this year, set to open Monday.
While burning cigarettes emit over 4,000 different agents (2), the evidence that nicotine is the main culprit in maintaining addiction is strong.
