After identifying the abnormal development of Homo sapiens’ brain as the cause of all the evils afflicting the biosphere—namely, the carcinogenesis of the tumor that we have now become for planet Earth—this book highlights the limits that nonetheless mark that abnormal development. Beyond a certain level of expansion, in fact, our brain cannot go, and although it has managed to destroy a large part of other living beings, it is not capable of reconstituting the balance of natural elements that, over millions and millions of years, had formed spontaneously. And without that balance, life cannot survive. Hence the mad and desperate race to seek an intelligence more effective than our own, capable of restoring a sustainable equilibrium for the elements of nature that we have not yet destroyed.
After identifying the abnormal development of Homo sapiens’ brain as the cause of all the evils afflicting the biosphere—namely, the carcinogenesis of the tumor that we have now become for planet Earth—this book highlights the limits that nonetheless mark that abnormal development. Beyond a certain level of expansion, in fact, our brain cannot go, and although it has managed to destroy a large part of other living beings, it is not capable of reconstituting the balance of natural elements that, over millions and millions of years, had formed spontaneously. And without that balance, life cannot survive. Hence the mad and desperate race to seek an intelligence more effective than our own, capable of restoring a sustainable equilibrium for the elements of nature that we have not yet destroyed.
Those who have had the chance to become familiar with cancerist theory through the various books and articles I have written will have understood that, in my view, the origin of the illness that has struck planet Earth can be traced to the abnormal evolution undergone by the brains of us primates belonging to the genus Homo.
The genetic mutation responsible for that evolution irreversibly altered the structure of our “command organ” and, in effect, transformed us into the planet’s cancerous cells.
From that point forward, we—small cells of the great organism—began to attack nature in a way entirely analogous to how malignant tumor cells attack healthy cells in the body of a cancer patient.
I have tried to explore this concept more deeply in my writings and in conversations with friends and scholars. I consider it the foundational concept of Cancerism, and I reserve the right to develop it further in the future.
But there is another concept which, subordinate to the first, is of enormous importance for Cancerism: the idea that the capacities of our brain, however hyper-developed, are still very little when set against the complexity of nature.
In simpler words, our intelligence is limited—and this is why, although we have been able to alter the balance of the biosphere, we are not able to restore it with stability comparable to what existed before our devastating intervention.
This book—the fifth in cancerist theory—is devoted to a deeper examination of that theme.
I had already addressed the subject in a chapter of the fourth book (“Revelation”). Drawing on those pages, and mindful of the importance of this second foundational concept of the theory, I decided to broaden the inquiry by dedicating this new essay to the limitations of our intellectual capacities.
The particular perspective that will guide us along this itinerary will show how the disastrous outcome of our species’ adventure would have been amply predictable, if only we had observed reality objectively, rather than with the puffed-up arrogance of a ruler by divine right (a phrase coined precisely to justify a prerogative that does not exist in the world of nature).
We could not have changed course, because genetic alterations do not depend on the will of living beings, but we could have limited the damage that our “superpowers” are inflicting on the biosphere. And we did not.
Can we begin now? Hard to say.
My hope is that reading this essay may contribute to a collective rethinking and push us to look upon reality in a spirit different from the one that has moved the human genus up to now.
In this detailed essay, published as a book of six chapters, Italian author Bruno Cesare Antonio Sebastiani explores the role of human intelligence in humanity’s expansive destruction of earth’s ecology while becoming the dominant species on the planet. The Limits of Intelligence is the 5th book in Sebastiani’s Cancerism series, i.e. his hypothesis that the boundless of the growth human species and its associated destruction of the planet’s ecology equate the spread of cancer in a previously healthy body.
While the book’s title is far less shocking and repulsive than his 2025 book The Planet's Cancer: Why Humanity Is Earth’s Malignancy (the first in the series), postulating humanity as a cancerous presence on the body of Mother Earth in the very Preface of this book may come as a turn-off to many readers. However, science students and rational readers will see Sebastiani build his case for his core concept on good scientific and philosophical grounds. Using compelling analogies and medically established details of cellular growth patterns, the author draws clearly perceptible parallels between the growth of human species on earth and that of cancerous cells forming tumors in bodies of animals and people.
In exploring this link between human intelligence and ecological destruction, The Limits of Intelligence hits on several other related questions of which the one most likely looming over the reader’s mind is whether such destruction is reversible. And while the book’s subtitle “Why We Can Destroy Nature, but Cannot Recreate it” kind of gives it away, there is hope for achieving a balance by conscious effort and commitment to limit the pace of our progress.
While there are frequent references in this essay to relevant previous work in science and philosophical texts, Sebastiani keeps it quite concise and sharply focused in all chapters. Individual chapters are fairly short, the longest being the final chapter dealing with artificial intelligence. Readers will learn quite a few surprising and even alarming facts and recent developments in these pages whether it’s about cell biology, development of brain, or innovations in advanced computing.
The Limits of Intelligence floats on the confluence of science and ethics, appealing at once to the intellect and the conscience. Spanning the bandwidth of knowledge from Lovelock’s Gaia Hypothesis to Nietzsche's Will to Power, it’s a book as much for the scholar as for a college student and any curious reader with just basic knowledge of science. Those interested in current affairs and environmental policies would also find it a meaningful and timely publication.