U.S. energy consumption rose slightly in 2016 despite a significant decline in coal use. consumption/demandnatural gasoil/petroleumrenewables. Total U.S. energy production falls in 2016 after six consecutive years of increases. crude oilnatural gasnuclearpetroleum productsproduction/supplyrenewablestotal energy.
What Causes Throat Mucus & Phlegm? Post Nasal Drip:Post nasal drip occurs when an excessive amount of mucus accumulation in the nose and throat creates phlegm and causes coughing. Cold or Flu: During a cold or the flu, there is a production of clear, thin mucus in the nose and back of the throat.
1 Smoking can cause serious lung problems and can aggravate respiratory infections. 2  It also irritates the mucus membranes and causes the lungs to produce excessive chest mucus. 3  Treat nasal and sinus infections as soon as they occur as these often lead to chest infections or bronchial blockage, and can cause phlegm.