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.
Advanced tidal power plants have yet to become widely deployed technologies, which is why the question What are the environmental impacts of tidal energy? has yet to find a comprehensive answer. As tidal energy moves beyond the stage of prototype and demonstrative projects, researchers will be able to find out more about how this renewable source of energy impacts Mother Nature.