ABU DHABI (MarketWatch) -- My walk to work on Saturday mornings takes me by three- and four-story apartment blocks and three- and four-story single-family villas, some of which are landscaped and others that have been given over to nature. Giving a lawn over to nature in North America is an invitation to weeds and clover. Here, it's an invitation to sand. Heck, there's a lot of uninvited sand here, too. It sticks to our windows; it covers our cars.