@misc{10784,
  abstract     = {{Replacing carbon-based fuels with hydrogen will not sustainably prevent an ice cube from melting, as CO2 is just one of the (many) causes of human-caused climate change.
From an energetic and climatic point of view, it does not matter whether the heat input into the atmosphere occurs through the combustion of fossil carbon or through the combustion of hydrogen (which is difficult to produce):
The desired decarbonization alone cannot slow the speed of climate change in our time. Whether global primary energy consumption is based on carbon or hydrogen remains irrelevant to the lifetime of the heat-storing CO2 molecules in atmosphere. Several literature sources on the lifetime of CO2 in the atmosphere vary between a few decades and 1000 years. It is possible that the differences in lifetime are due to the fact that different system boundaries are taken into account.
The start of slowing climate change the day after CO2 is no longer released into the atmosphere will certainly only have noticeable consequences several generations later.
From today's perspective, the hydrogen-based energy economy cannot be an equivalent replacement for a carbon-based energy economy, but rather only an intermediate step on the way to greater energy efficiency. Energy efficiency means that the ratio between the effort for “energy production” (actually energy conversion) and the benefit as “energy use” (proportion of energy that can be converted into work) must decrease significantly. How? For example, by developing more energy-efficient processes and machines, improving heat storage, using CO2-free renewable energies and using waste heat as much as possible.
Sustainability is nothing more than common sense and concerning the use of energy it means daring to be more energetically truthful through greater energy efficiency.
}},
  author       = {{Sietz, Manfred}},
  keywords     = {{Grüner Wasserstoff, Decarbonisierung, Klimawandel, Meeresspiegelerhöhung, Nachhaltigkeit, green hydrogen, decarbonization, climate change, sea level rise, sustainability}},
  pages        = {{8}},
  publisher    = {{Technische Hochschule Ostwestfalen-Lippe}},
  title        = {{{Von grünem Wasserstoff und farblosem CO2}}},
  year         = {{2023}},
}

@techreport{2184,
  abstract     = {{Material flows and energy flows can be correlated with sufficient data, e.g. on production energies, annual production quantities and degrees of dissipation with temperature increases in the atmosphere, volumes of molten ice or sea level increases, as well as with probability statements, information densities and management recommendations. All these quantities can be described by the comprehensive term entropy.
In order to consider the efficiency of material and energy flows, the difficulty to understand the concept of entropy with its different definitions can be summarized simply and easily in a model related to ice cubes.
The quality of a model containing percentage probability statements, statements on dissipation in material flow models in connection with statements on information density and its description by the ice cube model is still to be determined in practice in suitable material flow models. Such projects should show the types of mathematical correlations between dissipation degrees, entropy increase, increase of molten ice and sea level rise.
}},
  author       = {{Sietz, Manfred and Wrenger, Burkhard}},
  keywords     = {{Entropy, Ice Cube, Sustainability, Sea Level Rise, Information Density, Probability Statements, Material Flow Model, Dissipation}},
  title        = {{{Entropie eines Eiswürfels, Wahrscheinlichkeitsaussagen und Meeresspiegelerhöhung}}},
  doi          = {{10.25644/76E5-PC61}},
  year         = {{2020}},
}