核能係non-renewable energy 咩?

Because nuclear power is not renewed from an external energy source, it does not meet the conventional definition of renewable energy. 'Renewable', as a term in modern usage, was coined during the energy crisis of the 1970s and was clearly meant to exclude nuclear power [13]. Inclusion of nuclear power under the "renewable energy" umbrella may render nuclear power projects eligible for development aid under various jurisdictions. Arguments in favor of including nuclear power under renewable energy title are based on the potentially large amount of raw materials that may become available to fuel nuclear fission. In 1983 the physicist Bernard Cohen calculated the useful lifetime of nuclear power in the billions of years — longer than the life of the sun itself, remarking that this should qualify it as a renewable resource. Accidents notwithstanding, and ignoring decommissioning issues, the relatively little direct pollution from nuclear power plants while productive is also often cited (see Sustainable energy).

Nuclear has been referred to as "renewable" by the President of the United States George W. Bush and United Kingdom politician Lord David Sainsbury.[14][15].

No legislative body has yet included nuclear energy under any legal definition of "renewable energy sources" for provision of development support (see: Renewable energy development). Similarly, statutory and scientific definitions of renewable energies by-and-large exclude nuclear energy. In England and Wales there is a Non-Fossil Fuel Obligation [16], which provides support for renewable energy. Nuclear power production is promoted indirectly, by exclusion from this obligation.



The renewable energy are:
Wind power

Hydroelectric energy is a term usually reserved for hydroelectric dams.

Tidal power captures energy from the tides in vertical direction. Tides come in, raise water levels in a basin, and tides roll out. The water must pass through a turbine to get out of the basin. If the basin is a river delta then silt will block the turbine.

Tidal stream power captures a stream of water as it is pushed horizontally around the world by tides.

Wave power uses the energy in waves. The waves will usually make large pontoons go up and down in the water, leaving an area with no waves in the "shadow".

Ocean thermal energy conversion (OTEC) uses the temperature difference between the warmer surface of the ocean and the cool (or cold) lower recesses. To this end, it employs a cyclic heat engine.

Deep lake water cooling, although not technically an energy generation method, can save a lot of energy in summer. It uses submerged pipes as a heat sink for climate control systems. Lake-bottom water is a year-round local constant of about 4 °C.

Blue energy is the reverse of desalination. A difference in salt concentration exists between seawater and river water. This gradient can be utilized to generate electricity by separating positive and negative ions by ion specific membranes. Brackish water is produced. This form of energy is in research; costs are not the issue, and tests on pollution of the membrane are in progress. At this moment it is predicted that if everything works out, 33% of the electricity needs in the Netherlands could be covered with this system.(2005)

Solar energy

Geothermal energy