This chart gives data on greenhouse gas emissions in the United States from 1990 to 2013. Which questions would help clarify the evidence in the chart? Graph of U.S. Greenhouse Gas Emissions by Gas, 1990-2013. Horizontal line, 1990-2013. Bottom to above, gases shaded are Fluorinated, Other greenhouse, Methane, Carbon Dioxide in million metric tons of carbon dioxide equivalents ranging from 0-8,000.