advantages: coal is plentiful and energy dense, technological demands for surface mining are small and costs are low; oil is convenient to transport/use, energy dense, burns cleaner than coal and is more CO2 efficient than coal; natural gas contains fewer impurities than coal and oil and releases 60% as much CO2 as coal does.
Which of the following conditions is most likely directly linked to tobacco use? A. influenza B. lung cancer C. pneumonia D. diabetes. Lung cancer is most likely directly linked to tobacco use.
Years of study and a mountain of evidence point to tobacco smoking as the single most important risk factor for lung cancer. Nonsmokers (people who have smoked fewer than 100 cigarettes over the course of their lives) have less than a 1% chance of ever developing lung cancer.