Thank you so much for your comments. About the time to exhaustion of hydrogen, I wonder if it would burn less with time, helping to reduce global warming in the time being. Hahaha. That's never gonna happen, I suppose. My dad was right again. I remember on one of our long walks, he told me about how the sun is a star that burns a gas which could be exhausted and the star would die. He said I shouldn't worry about it because we would all be long gone before our sun dies.

I appreciate your comments. Thanks a lot. All the best, man.