Provenance it moves from hand to hand." Another metaphor is that provenience is an artifact's "birthplace", while provenance is its "résumé", though this is imprecise (many artifacts originated as trade goods created in one region but were used and finally deposited in another). Aside from scientific precision, a need for the distinction in these fields has been described thus: In this context, the "provenance" can occasionally be the detailed history of where an object has been since its creation, as in art history contexts – not just since its modern finding. In some cases, such as where there is an inscription
Issues relating to biofuels ecosystems including rainforest in South America. In forest ecosystems, these effects themselves will undermine the climate benefits of alternative fuels, in addition to representing a major threat to global biodiversity. Although biofuels are generally considered to improve net carbon output, biodiesel and other fuels do produce local air pollution, including nitrogen oxides, the principal cause of smog. Issues relating to biofuels There are various social, economic, environmental and technical issues with biofuel production and use, which have been discussed in the popular media and scientific journals. These include: the effect of moderating oil prices, the "food vs fuel" debate, poverty