Steven Johnson: How humanity doubled life expectancy in a century | TED

TL;DR

Discover the incredible progress made in global life expectancy over the past century and explore the prime movers that have driven this change.

Transcript

Here's a classic thought experiment that's designed to trick your brain into thinking long-term and getting out of the daily news cycle. And it goes like this: if a newspaper came out once a century, what would the front page banner headline be? “We defeated the Nazis,” or “landed on the moon,” or "built the Internet"? I would argue that it would b... Read More

Key Insights

• 🌍 Life expectancy has doubled globally over the past century, from the mid 30s to just over 70, showcasing significant progress in human health and longevity.
• 🗺️ In 1950, only five countries in northern Europe had a life expectancy above 70, while a third of the world had life expectancy below 45. This has drastically changed, with no countries below 45 and few below 60 today.
• 🔎 Mortality rates in the past were higher for children, with a significant portion not surviving past five years old. More than half of the population did not live past 45 years old.
• 🌱 Increased life expectancy has led to a significant increase in the world population, which comes with challenges like climate change due to increased carbon emissions.
• 💉 Vaccines have played a crucial role in improving life expectancy, and highlighting their success, such as the eradication of smallpox, can help combat vaccine hesitancy.
• 🥛 The story of milk in the 19th century illustrates the importance of not only scientific innovation but also societal and institutional change in solving health problems.
• 💊 Large bureaucratic institutions like the FDA have played a vital role in regulating and ensuring the safety of pharmaceutical drugs and medical treatments.
• 🌍 The future of health should focus on reducing health disparities and improving health outcomes for all, rather than solely extending life indefinitely. Closing the gap between health span and lifespan should be a priority.

Questions & Answers

Q: What is the thought experiment mentioned in the video?

The thought experiment asks what the front page banner headline would be if a newspaper came out once a century.

Q: According to the speaker, what is the most elemental measure of progress?

The speaker argues that life expectancy at birth is the most elemental measure of progress.

Q: How has global life expectancy changed over the past century?

Over the past century, global life expectancy has doubled, going from the mid 30s to just over 70.

Q: What is the significance of the maps shown in the video?

The maps demonstrate the geographical distribution of life expectancy in the years 1950 and 2015, showing a significant increase in countries with life expectancies above 70.

Q: Are improvements in life expectancy just a statistical illusion?

No, improvements in life expectancy are not solely due to reductions in infant mortality. The speaker argues that the story is much richer and that progress has been made across different age groups.

Q: What is the unintended consequence of increased longevity?

The unintended consequence of increased longevity is the exacerbation of problems like climate change due to the rise in population caused by people living longer.

Q: What are some prime movers in achieving momentous change?

Vaccines are mentioned as a prime mover, along with persuasive efforts to drive change on a societal level. The speaker also emphasizes the importance of large bureaucratic institutions and regulatory bodies in effecting change.

Q: What should be the focus of future health innovations?

Instead of solely focusing on extending life indefinitely, the speaker suggests that efforts should be focused on reducing gaps in health outcomes and improving health span, the amount of time spent in a healthy and full capacity state.

Summary & Key Takeaways

• Life expectancy at birth has doubled globally in the past 100 years, from the mid-30s to over 70, demonstrating significant progress in human health.

• The increase in life expectancy is not solely due to reducing infant mortality but extends across various age groups, indicating overall improvements in health outcomes.

• Large bureaucratic institutions and societal changes, alongside scientific advancements like vaccines, have played crucial roles in achieving these improvements, emphasizing the need for multidimensional approaches in effecting change.