This pie chart presents data on sources of methane emissions in the united states between 1990 and 2013. which questions would clarify the evidence in the chart? (note: enteric fermentation is a way that some animals digest food.) what are the other sources of methane gas that are responsible for 8% of emissions? which type of livestock releases the highest quantities of methane gas during digestion? what is the predicted rate of increase for the emission of fluorinated gases in the twenty-first century? which gases are released during production of electricity from fossil fuels? which production processes lead to the release of carbon dioxide during coal mining?