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.
Fossil fuels can be used at reduced levels as transition fuels to a renewable energy economy, or at higher levels if carbon sinks prove to be economical. Natural gas could serve as a transition fuel to hydrogen derived from solar energy, since the infrastructure for use would be similar for the two gaseous fuels. Natural gas can be complemented by renewable energy sources such as solar energy, biomass fuels (renewably produced and used), and wind energy. Wind energy and solar energy are economical under some circumstances (such as areas with high wind speed or high insolation and low precipitation).