About [2]: It was discussed in
https://news.ycombinator.com/item?id=18301190 (122 points | Oct 25, 2018 | 129 comments). Some takeaway of the comments:
They don't extract water from air, they partially burn (gasify) biomass to produce water, carbon dioxide and charcoal. They extract the water from the fumes where it is more concentrated. (It's strange that they can dump all the heat, they need some good coolers.)
The cost is 1/2 of the cost of the desalinization, 2 times the cost of calling a water truck for the town, and 100 times the cost of tap water in a city. But the cost they quote is only the cost of the equipment, they don't include maintenance and they don't include the cost of the biomass.
The places were biomass is cheap and there is plenty of biomass are the places where there is enough water to grow crops or trees. It's not efficient to buy wood just to burn it to extract the water. Moreover, growing the tree will consume much more water than the water that you can extract with this device. Also, it's cheaper to call a water truck than enough truck with all the wood to produce the same amount of water.
> A single shipping container can hold many acres worth of short crops that can be grown on top of each other.
The plants need sunlight. It is possible to replace it with artificial light, but it is more expensive. At industrial scales it is worth only for plants that have a very high ratio of price per weights, not simple crops.