I think it could be interesting to show streamgraphs (time vs % type) faceted by countries. That would give us an idea on how the emissions have changed over time

Be careful with what you compare. What are these units? %s? BTW, I see coal declining from 2014, but CO2 steady. Probably because of petroleum and gas increases You could also add data on how much co2 is added to the atmosphere by each unit consumed for each type of energy