How can this be claimed? Rational numbers can be sorted and even counted. But real numbers can also be sorted and counted - in practice. If we do not want to take them as mere symbols, but relate them to the rest of the world, so that we can do calculations with them, we use … Continue reading The ratio of the number of real to rational numbers is about 5
Global development of interest rates since 1350 The "Zeit" reports on the study by Paul Schmelzing from Yale University about the long-term decrease in lending rates. The low interest rates run parallel to another development: productivity growth in the OECD countries is only just above zero. OECD yearly labour productivity growth (source) Interest on loans … Continue reading The Heat Death of Interest Rates
This article in The New Yorker reviews three books that deal with the peculiar fact that the opinion of many people on a particular matter seems to be unaffected by facts. How can it be, that is the puzzling question, that this preference of the human mind to stick to its own conception, which everyone … Continue reading Facts and Minds – a story of troubles
Credit: NASA There are many news about the decrease of the earth's forest area, but there are also a number of publications documenting a greening due to the CO2 fertilization effect and other human influences such as nitrogen fertilization. As one example I give a paper from 2013, the title of which gives hope: "Deserts … Continue reading Does CO2 fertilization make the world greener – or not?
The EU cap and trade system, the EU ETS (Emissions Trading System), is (still) the most important emissions cap system in the world and one of the two pillars on which the EU's policy to reduce emissions is based. I prefer the term "cap system" over "trading system", because the falling emission cap is the … Continue reading Emission trading systems of the world – unite!
Spontaneous mathematical speculation. Irrational numbers are characterized by the fact that they can only be described as the limiting value of a sequence. I wondered if there are numbers that cannot even be described that way. I would call them "illusive numbers". The sequences that describe the known irrational numbers, arise from recursive instructions, that … Continue reading Illusive Numbers
(Image: BarneyElo, Pixabay) The German energy demand is currently only covered to 17 % from renewable sources, albeit with an increasing tendency of half a percent per year (statista.de). So 83 % are still missing for a complete decarbonization. The majority of this, namely 71 % of the total requirement, is currently covered by imports … Continue reading Energy from North Africa: H2 or HVDC?
As construction and use of buildings is one of the largest contributors of GHGs, this sector has to undergo a major transformation to achieve climate neutrality. use wood Concerning construction, the use of concrete has to be avoided, because the production of cement is a particularly emission intensive process (see e.g. here). The best solution … Continue reading Some basic concepts of climate neutral building
Every human being with free mental capacity does think from time to time about the future of the world in the next 100 or 200 years. It used to be different: the world was the outside, immensely large and full of dangers, imponderables and possibilities. The largest units, whose future people were thinking about, were … Continue reading The big picture: education of women
In November, I submitted this petition to the German Bundestag, to contain unmissably in each car advertising the CO2 emissions for 10,000 km drive and the production of the car. Recently it was posted on the Bundestag petition forum website (see this post). The opportunity to comment or sign up there is now over. 52 … Continue reading #emissionvaluesintocarads – update 2