Tags. Worldwide: UNAIDS estimates that as of December 2000, there were an estimated 36.1 million people living with HIV/AIDS (34.7 million adults and 1.4 million children under 15). Since the epidemic began, an estimated 21.8 million people have died of AIDS (17.5 million adults and 4.3 million children under 15).
Definition. Black lung disease is the common name for coal workers' pneumoconiosis (CWP) or anthracosis, a lung disease of older workers in the coal industry, caused by inhalation, over many years, of small amounts of coal dust.he only way to prevent black lung disease is to avoid long-term exposure to coal dust. Coal mines may help prevent the condition by lowering coal dust levels and providing protective clothes to coal miners. A light micrograph of a human lung containing particles of inspired coal dust (anthracosis).
TYPES OF COAL Coal is classified into four main types, or ranks (lignite, subbituminous, bituminous,anthracite), depending on the amounts and types of carbon it contains and on the amountof heat energy it can produce.ignite is the lowest rank of coal with the lowest energy content. Lignite coal depositstend to be relatively young coal deposits that were not subjected to extreme heat orpressure. Lignite is crumbly and has high moisture content.