Re: I made it clear in my post that I do support research into other energy sources. I stated that very clearly.
That's what I thought, but when I stated this, you got all defensive. Obviously, you want a conversation, but on your own terms, going at your own pace, in the direction that makes your point. When I try to segway into something I find important, you get all offended.
Let's try something different. We have a common ground here, so let's build off of that.
Re: I also stated that those other sources are of limited value for reasons that cannot be solved by development.
Here's where we differ. I think history has proven that investing in almost anything can result in improvements in costs, efficiency, usefulness, and availability. "Maximum limits of physics" is a cop out by those who have given up trying. Like my old college professor who told me I shouldn't bother looking for a job in the semiconductor industry because THE LAWS OF PHYSICS absolutely positively prevented making transistors smaller than 100nm, and so that industry would collapse by the end of the 20th century. Now we have devices made from billions of transistors half that size (in one dimension) in high volume manufacturing.
Never underestimate ingenuity, new materials, new discoveries, and new ways of doing things. The next break-through in solar, wind, and tidal may be just around the corner, but needs a means to lower the barrier for private firms to invest in it.