"The entire planet’s electrical consumption is right around 5 terawatt-hours."
5TWh per what? Per second? Per hour (then why not 5TW?)? Per year? Cumulative over all of human history?
Write it out and algebraically cancel the units and you'l understand that you don't understand, and then maybe you will.
As a rule, in future, try to understand before mocking, its a better way to live, take it from me...
In particular, Terawatt-hours can be converted to Joules. To say that humanity's energy usage is X Joules is meaningless without specifying the time period that that energy is used over. For example, it means very different things to say that humanity uses 5 TWh per day than to say that humanity uses 5 TWh per year (versus 5 TWh since the dawn of recorded history!).
"[NERD NOTE: A terawatt is a trillion watts. The entire planet’s electrical consumption is right around 5 terawatt-hours. One TWh (terawatt-hour) is a constant flow of a trillion watts of electricity for a period of one hour.]"
The argument others are making (which I think is correct) is that it is meaningless to say "The entire planet’s electrical consumption is right around 5 terawatt-hours" without specifying a time frame over which that consumption occurs.
The original article has an error as pointed out by the parent. Insert ironic mocking statement here.