This pie chart presents data on sources of methane emissions in the United States between 1990 and 2013. Which questions would help clarify the evidence in the chart? (Note: Enteric fermentation is a way that some animals digest food.)

Pie chart representing different sources of methane emissions in the united states.

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?