Educators should note the stack percentages in the 3 energy sources (fossil fuel, nuclear and renewables). For instance, percentage of energy production in the chart from South Africa is fossil fuel (89%) and nuclear (no value); yet there is a graduation: renewables (6.2%). Thus, nuclear should have had a value of 4.8%, but this is missing in the content. It is not out of place for educators to sort the missing values for other countries since the chart has the graduation already. The resource is recommended for teaching.