"The deuterium in a single cubic meter of seawater contains the as much energy as nearly 1,400 barrels of crude oil - enough to supply the civilizaton's energy needs for hundreds of millions of years - until long after the Sun itself has flamed out."

What does that sentence mean? It seems like a claim that the energy of 1,400 barrels of crude oil is enough to sustain civilization for a long time, but that seems implausible to me. Also, off by an order of magnitude on the timeline for the sun burning out.

Whenever I read stuff like this now I start to get paranoid that this is written by GPT-3.