- This new book by Henry Gee, the celebrated British paleontologist and senior editor of the prestigious scientific journal Nature, is well worth reading.
- Gee has the ability, rare for academics, to write exceptionally clear and rhythmic sentences. His prose sucks you in. (A bit like Paul Krugman on economics). His early chapters in Part One describe in detail the history of Homo Sapiens since its emergence around 315,000 years ago, and its very likely demise in only 10,000 years time.
- Most readers will skim these chapters unless they're fascinated by paleontology and space. But in Part Two Gee turns to our current times and where the human race is likely to be in only 200 years time. They are fascinating chapters.
- We learn about the rapid growth of the world’s human population over the last century particularly, and the rapid decline that awaits us over the next two centuries. (And after ten thousand years homo sapiens will be wiped from the face of the earth all together).
- I virtually underlined every second sentence of these chapters. Here are some amazing numbers:
World population in 1964: 3.267 billion. Population now: 8.2 billion. Likely population in 2100: 6.29 billion. (China: 1.412 billion now; 732 million by 2100). Likely population by 2200: between 2.6 and 5.6 billion. By 2300: between 0.9 and 3.2 billion.
Countries with increasing populations: Nigeria: 200 million now but 791 million by 2100. Many countries will see a substantial increase in population by 2100, including Australia, because of substantial African immigration, and Israel's population will grow from 9.5 million now to 24 million in 2100 because of its higher fertility rate.
Why is the human population on the cusp of steep decline? Lower birth rates due to the educational empowerment of women and the increasing take-up of contraception. Also, for reasons nobody can quite fathom, human sperm count has fallen, both markedly and recently.
Climate change: Up to 200 million people (3% of all humans) live in coastal cities that will be below mean high tide by 2100. If the temperature rise gets as far as 4% above pre-industrial levels, a billion people could be flooded out. Cities such as New York could be two metres underwater by the end of this century.
Extreme heat could depopulate large areas of the Middle East, where the current inhabitants will have to move or die. Deadly heatwaves of up to 55 degrees will be an everyday reality. A huge migration of refugees from Africa into Eurasia will take place.