Arguably, I'd say the only one that's really proven itself over the long term is solar; as the Earth is essentially a closed system with only solar energy as an input, it's proven that there is amply "enough" input solar energy falling on half of the globe at any given time to drive that system.
Agree that solar (with appropriate means of storage) is probably the most viable. But disagree with your statement that the Earth is a closed system. The only input may be solar energy, but there certainly is an output in radiating heat / energy into space. The net must be pretty close to zero, though I imagine it oscilates positive to negative over time (say on the frequency of the ice ages...)
When DFW/IAH gets shutdown the ripples will be national, good luck finding a flight anywhere.
Sorry, but not everything revolves around Texas... I flew regularly on business for just over a decade and the only time I flew in/out of Texas was when that was my destination. Seriously why can't we all just ratchet down the rhetoric about a dozen notches and have a bit more rational conversation... (especially in our political discussions)!
Yes, absolutely. Backing up to the cloud implies that you have the originals NOT in the cloud. In this case it appears many people are in shock and awe that the ONLY COPY OF THEIR FILES IN EXISTENCE is no longer available.
There is a difference between backing up to the cloud and storing your sole copy of a file there...
Backups should still exist, whether the originals be at home / work or in the cloud.
New crypt. See /usr/news/crypt.