Efficiency of Energy Saving and Diverse Renewable Energy Technologies

21 July 2021, backstage information:  Everyone can and may contribute by Energy Saving to the man-made climate change which causes disastrous weathers – may it be heavy rainfalls, prolonged draught or heat.  Such energy saving can include the use of public transport networks, or to use delivery services instead as driving car, etcetera. All in all, the energy saving of many people together is very efficient.
When it comes to produce renewable energy the solar PV (Photo Voltaic) might be the most environment friendly option.
Reasons:
Green Hydrogen is not a source of energy production - it is only a technology to use water electrolysis to store and transport energy. But this Green Hydrogen or H2 has to be produced from wind energy, biogas, hydropower or PV, which means that these technologies must first be expanded in order to be able to produce Green Hydrogen. Please see  H2 – Green Hydrogen below in our Information Service: There Ms Güllü Beydilli writes „The electricity from green sources is used for water electrolysis to split water molecules and produce hydrogen. This hydrogen can in turn be used as energy storage, stored in tanks or even underground caves and transported via pipelines, tankers or trucks. Thanks to hydrogen technology, green energy plants can be used independently of environmental conditions and thus become more reliable.“
Wind energy kills many birds of prey and other birds as well as bats and reduces the habitat for other birds like geese, bustards and cranes. Thus, it can have a huge negative impact on biodiversity.
Biogas from plants seems a single catastrophe in terms of environmental policy. Originally, waste from agriculture was supposed to be used. In reality, maize and other intensive fruits are grown with subsidies. The need for fertilizers and pesticides is huge and is in part at the expense of the tropical countries that produce the fertilizer. The damage to the groundwater resources cannot yet be foreseen, but eutrophication is already one of the main reasons for species extinction in many terrestrial and aquatic habitats. In addition, valuable agricultural land for food production is lost in favour of biogas production. The whole thing is financed by German and EU taxpayers' money.
Hydropower:  In Germany, hydropower is the least efficient form of energy in relation to environmental damage. Many animal species in the waters normally migrate, but this is interrupted by the barriers used to generate energy. Wandering animals are killed, if they pass the turbines. Hydropower only contributes very little to electricity generation and has no further potential here in Germany.
Photo Voltaic: It would make sense to generate electricity on all roofs in Germany, because then it is generated where it is needed. And we don't have to build so called electricity highways from north to south. Unfortunately, people are still building PV parks in the agricultural landscape - also causing loss of area for food production.