Blacking out and removing hidden information in PDFs by conversion to raster format

PDF documents may contain information which an author may remove before publication or sharing with specific target groups. While PDF editors (eg, Linux/Xournal) or graphic programs(eg Linux/GIMP) allow “blacking out” information, PDF files with vectorized information keep the hidden information, eg text, which can be marked and copied and pasted into another document, and further…

FM radio transmitters and smartphones with FM radio receivers maybe a low-cost, high-quality audio system for public protests

1. Introduction Civil rights movements (“grassroots”) focusing, for example, on ecological justice,  racial justice, or economic justice have usually little budget available to organize public protests. Visual messages, eg posters and banners, and audible messages are key elements at public protests. While I am presenting tutorials to create visuals elsewhere [1], I want to propose…

Angela Merkel weiß seit 25 Jahren, dass 2020 der Point of No Return in der Klimakrise ist und handelt nicht

“Die Fortsetzung der gegenwärtigen Emissionspraxis (Business as Usual) würde uns zwar noch ca. 25 Jahre Zeit geben, dann aber innerhalb weniger Jahre einen solch drastischen Minderungszwang erfordern, daß kaum Strukturen und Technologien vorstellbar sind, die diese Minderung erbringen könnten.” (Wissenschaftlicher Beirat der Bundesregierung Globale Umweltveränderungen, 1995) [1, Seite 1] Als Bundesumweltministerin und Leiterin der 1.…

Racism – A statistical comment

Big data and artificial intelligence may be useful in fighting racism, if we replace race as a (weak) predictor of future behaviour (eg past of future crime) [Reference missing] with other (sufficiently) informative predictors (eg social score?). However, this would require citizens to share personal information with public authorities, which creates new risks. However, by…

Capitalism, growth, and the planetary boundaries

1. Introduction It is a common assumption that the global neoliberal capitalist economic system requires economic growth in terms of the gross domestic product (GDP) to avoid recession an collapse. Scientists argue that constant (exponential) growth is not possible on a finite planet and the continuing conversion of natural resources (abiotic and biotic) will deplete…

An Indian philosophical approach to climate action [DRAFT]

Summary The following text presents the concept of the “three modes of nature”, ie tamas (“passivity”), rajas (“activity”), and sattwa (“balance”),  from Indian philosophy. The basic idea states that these conflicting modes of human nature (prakriti)  creates a fundamental dilemma which does not allow humans to perform good, peaceful and powerful actions in the real…

Negative impact of universities on the climate emergency

Here, I would like to present some short reflections on negative impact of universities on the climate emergency, as pointed out by Prof Kevin Anderson [1]: international scientific collaboration most often by air travel international personal/romantic relationships locking people in high-carbon futures providing high-level education, leading to high salaries, and high consumption Ad 1) Personally,…

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