Almost no one mentions the fastest, easiest, and most effective way to solve the crises that today threaten humanity: To decrease energy and resource consumption.

The standard approach to cosmology is: 1. Construct an overly simplified model. 2. Deduce its general relativistic consequences (Friedmann's equations). 3. Observe that they do not correspond to the real universe. 4. Invent increasingly many "amendments" (LCDM: dark energy, dark matter + additional free parameters) to save the model. We, instead, point out that full nonlinear gravity itself has the potential to explain cosmological observations without the introduction of hypothetical ingredients. This essay hopes to communicate the necessity of taking seriously the real, observed, "lumpy" universe and the resulting automatic nonlinearities of general relativity, instead of allowing an oversimplified "smooth" cosmological model to perpetuate a consensus worldview of a universe allegedly dominated by mysterious "dark", and never seen, components.

The arena of quantum theory is the abstract, unobserved and unobservable, M-dimensional Hilbert space [not equal to] spacetime. II. The arena of observations, and all events (i.e. everything) in the real physical world, is the classical 4-dimensional physical spacetime of general relativity. III. The "Born Rule" is the random process "magically" transforming I. into II. Formulations of quantum theory directly in real physical spacetime constitute examples of "locally real" theories (Clauser & Horne) and are empirically refuted by the numerous tests of Bell's theorem. When separated and treated correctly in this way, a number of fundamental problems and "paradoxes" of gravity vs. quantum theory simply vanish, such as the black hole information paradox, the cosmological constant problem and quantization of general relativity.

The world’s obsession with more wealth, more produce, more comfort etc. has createdthe conditions for a planetary climate that threatens to collapse, and an inflationaryglobal economic system stuck in an ever-worsening debt spiral. To save the planet, andthe economy, only degrowth can save us.

I. The arena of quantum mechanics and quantum field theory is the abstract, unobserved and unobservable, M-dimensional formal Hilbert space ≠ spacetime. II. The arena of observations—and, more generally, of all events (i.e., everything) in the real physical world—is the classical four-dimensional physical spacetime. III. The “Born rule” is the random process “magically” transforming I into II. Wavefunctions are superposed and entangled only in the abstract space I, never in spacetime II. Attempted formulations of quantum theory directly in real physical spacetime actually constitute examples of “locally real” theories, as defined by Clauser and Horne, and are therefore already empirically refuted by the numerous tests of Bell’s theorem in real, controlled experiments in laboratories here on Earth. Observed quantum entities (i.e., events) are never superposed or entangled as they: (1) exclusively “live” (manifest) in real physical spacetime and (2) are not described by entangled wavefunctions after “measurement” effectuated by III. When separated and treated correctly in this way, a number of fundamental problems and “paradoxes” of quantum theory vs. relativity (i.e., spacetime) simply vanish, such as the black hole information paradox, the infinite zero-point energy of quantum field theory and the quantization of general relativity.