Postings without closing dates are often positions that are difficult to fill or ones that come open frequently. An example of a position that is difficult to fill is a psychologist at a small-town state hospital. If the hospital left the job open for a month, it is unlikely to get a sufficient number of applicants.
The Disadvantages of Tidal Power Tidal power is growing rapidly in interest as countries look for ways to generate electricity without relying on fossil fuels. Tidal schemes have a number of advantages, including their lack of greenhouse gas emissions and 100% renewable nature.
Wave-power generators use the up-and-down motion of the oceanâs swells to produce electricity. Tidal generators act like underwater windmills, spinning as the tides move in and out. To get small projects in the water quicker federal regulators recently created a five-year pilot license for tidal and wave developments.