Pat is a PhD in biochemical engineering (full CV). Dr. Paul A. Curto, former Chief Technologist with NASA states of OTEC, it is by far the most balanced means to face the challenge of global warming. Like Nathan Wilson, Paul is of the opinion ammonia is the working fluid needed to bring offshore power to market.
OTEC is solar power without the intermittence. The oceans are the largest solar collector on the planet and provide the greatest heat sink as well in the depths. The second law of thermodynamics then provides the avenue for converting this solar power to work. To get this work to the market place it then needs to be converted to an energy carrier, hydrogn, ammonia, methanol and be conveyed across the oceans just like Middle Eastern Oil or LNG.
The thing is though there is 5 times more of it and it won't be running out in less than fifty years, or ever for that matter. And when you convert liquid ocean water to hydrogen you are also making a dent in the problem of sea level rise.
As in most things, science and engineering included, there are two sides to the story.