Their prices, given the informal nature of production, are lower than those of charcoal from planted trees, although the latter is generally produced in industrial, more efficient, facilities. Worse still, there are no incentives for the industries to exploit the gases from combustion, which can be used both for energy and non-energy production purposes. The rudimentary kilns used in the forests to carbonize native wood are unable to preserve the fluid by-products of charcoal production, but neither is this done even in the majority of the relatively modern facilities.