If it is properly sealed and the jars were sterilized jam will last for years. It is best to use it up though and not keep it that long because it can start to go thick and sometimes starts to crystalize. It is safe to eat though, just not so nice.
Technologies that promote sustainable energy include renewable energy sources, such as hydroelectricity, solar energy, wind energy, wave power, geothermal energy, bioenergy, tidal power and also technologies designed to improve energy efficiency. Costs have fallen dramatically in recent years, and continue to fall.eat pumps and Thermal energy storage are classes of technologies that can enable the utilization of renewable energy sources that would otherwise be inaccessible due to a temperature that is too low for utilization or a time lag between when the energy is available and when it is needed.
Types of Energy Sources. There are two types of energy sources, Renewable and Non-Renewable sources. Renewable energy sources are sources that can be replenished or which are available naturally in excess. Non-Renewable energy sources are limited in their availability.ome of the many forms of energy are: 1  Kinetic energy. 2  Potential energy. 3  Gravitational energy. 4  Nuclear energy. 5  Chemical energy. 6  Heat energy. 7  Electrical energy. 8  Electromagnetic energy. 9  Sound energy. 10  Solar energy.