Recently I discovered Carlo Rovelli, an Italian physicist and best-selling popular science writer and noticed he had written a book on Anaximander, an early Greek philosopher who lived around 150 years before Socrates in the sixth century BC. Though I read some of the Greek philosophers when I was younger, I don’t recall coming across Anaximander. I thoroughly enjoyed reading his book and so here is a review.
Anaximander (c. 610 – c. 546 BC), lived in Miletus, a city of Ionia (in modern-day Turkey) and was a student of Thales. Nothing but a few quotations and descriptions of his work survive in the works of later philosophers, but from this sparse information, Rovelli mounts a persuasive argument that Anaximander was the first true scientist, the first to suggest that order in the world was due to natural forces, not supernatural ones.
Greta Thunberg and Extinction Rebellion have been raising awareness of the urgent need to stop talking and start acting on global warming. The evidence that global warming is real and that it is human-caused is now overwhelming, but the public debate is regularly swamped by science deniers who in most cases clearly simply ignore or are ignorant of the evidence, and often are clearly clueless about how to assess evidence, or even what constitutes evidence.
The first illustration below, from a recent Economist issue, summarises the rise in average temperature across the earth’s surface in 2018 compared to the average for 1951-1980.
Many deniers claim that the current rising temperature is natural, resulting from ice age cycles or orbital variations of the earth. The graph below shows how current CO2 levels are dramatically higher and rising faster than in any interglacial period over the last half million years. And our best climate models predict temperature rises associated with CO2 levels which match measured temperatures over the last 40 years. If the impact of CO2 is excluded from the models, it is not possible to explain the observed rise in temperature (see graph below).