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.
Advantages to hydroelectric power: 1  Fuel is not burned so there is minimal pollution. 2  Water to run the power plant is provided free by nature. 3  Hydropower plays a major role in reducing greenhouse gas emissions. 4  Relatively low operations and maintenance costs. 5  The technology is reliable and proven over time.