This chart presents data on greenhouse gas emissions caused by human activity from 1990 to 2012. Which questions would help clarify this evidence? !THERE IS MORE THAN ONE ANSWER! (Earth science) 20 points.
a. Which source of electricity generation caused the most emissions?
b. What types of industries are responsible for greenhouse gas emissions?
c. Which natural sources of greenhouse gas emissions are shown here?
d. Why is agriculture the largest source of greenhouse gas emissions?
e. What caused the dip in greenhouse gas emissions in transportation after 2007?