The correct answer is - Better technology allows easier access to water supplies.
The advancements in the technology have made it possible for people to live in most of the places on the Earth if they want to. The transportation of goods, manufacturing goods, production of goods, have all reached new heights, which enable the life to be possible even in the middle of the arid or semi-arid regions.
The biggest problem in regions like this is usually the lack of water resources. But with the modern technology, water can be brought to the place through pipelines from hundreds of miles away, it can be transported with the modern vehicles in the form of bottled water, or if there's salty water in close proximity it can be freed from the salt and made suitable for drinking.
