It is always a consideration whether the further use of an older device does not require less energy or water than the production of a new, energy-efficient device. Therefore, the energy requirement along the entire product life cycle (from production to use to disposal) must be considered. Companies need the competence to weigh up the right time for a new purchase of devices, but also the determination to then purchase the most sustainable and not only cheapest devices.

LED 'light bulbs' are now available for really all lamps, even with pleasantly warm light colors. Also, think about the lights outside - are they LED as well?

An electricity storage system primarily helps to maximize the yield of the PV system if the electricity is not fed into the grid for little money, but comes from the battery in the evening and then allows the full electricity price to be saved. Another advantage can be that some batteries function as an off-grid system in the event of a power failure. Even if the students may prefer to cancel classes in this case :-) The already mentioned virtual power plants then access your battery from the outside and make the electricity available in the neighborhood and compensate you for it. This stabilizes power grids and even with little wind and no sun, we can live on renewable energies. Note on lithium: Lithium, like many other raw materials, is often problematic during mining. However, the life cycle assessment must take into account that we can recycle lithium over hundreds of years. In the basement, older lithium batteries from the automotive industry could later be given a second life, or sodium batteries that require more space.

Modern lamps require little electricity, but all in all it is worthwhile not to let them burn unnecessarily, for example when we are not in the room for a long time. Corridors, toilet rooms, basements often have the lights on unnecessarily. In some areas, schools also have the lights on too long or too early.

Air conditioning systems are also gaining in importance in temperate latitudes. Intelligent construction and ventilation and the use of thermal protection roller blinds can avoid these power guzzlers. In warm regions, a corresponding education of the guests can take place. Often a fan is also useful.

Saving water in schools refers to everything - the toilet flush with the economy button and even waterless pee basins, to automatic taps that only run for a short time, to energy-saving faucets in sinks and showers (gyms).

Organic is extremely important for biodiversity. We have the greatest extinction of species since the extinction of the dinosaurs and the consequences are greater than those of climate change. Pesticides and mineral fertilizers endanger our future. In addition, soils from organic farming usually store more carbon and thus help against the climate catastrophe.