A trillion. 1,000,000,000,000. A million millions. It’s a number that seems so far outside the scope of our everyday lives, but which, in many senses, is the defining scale of the Earth today. The prefix for a trillion is tera, curiously close to the Latin root word for Earth, terra. Because a trillion is used so much in this book to describe our terrestrial home, it’s worth describing a trillion in a few settings on Earth.
The world population is now closer to 10 billion than 5 billion. Imagine something that everyone on Earth has a little more than 100 of. Could be memories, or meals, or favorite songs. In many ways, lists of 100 would be a wonderful window into the lives of the citizens of the world. 130 memories per person on Earth. That’s a trillion memories, or a teramemory.
The top ten richest people in the world own over a trillion dollars in wealth. The world’s poorest 50% of people combined own less than those ten individuals. Wealth inequality is increasing substantially, and it might not be long before trillionaires exist.
The U.S. government now routinely creates economic stimulus packages on the order of a trillion dollars, both for the financial crisis in 2008 and the COVID-19 pandemic in 2020 and 2021. A trillion dollars is $3000 for every American.
In the climate space, industrial activity has led to over 2.2 trillion metric tons of carbon dioxide to be released into the atmosphere. The first trillion took centuries. The most recent trillion took only 30 years.
Over a trillion tons of carbon dioxide has accumulated in the atmosphere. The rest has gone into the ocean, where it has contributed to ocean acidification, or into the land.
Electricity generation hit 1 trillion watts (TW) worldwide in 1988. The world exceeded 2 TW in 2010, and world electricity usage is now around 2.5 TW. That’s about 330 W per person, although the usage is very unequally distributed among groups.
Can a tera-scale planet Earth be sustainable? Yes. There is enough power to feed and provide basic needs even for a population much larger than today’s, with everyone having a high standard of living. It is not, however, sustainable to support an economic system that requires continuous growth.
Sunlight is abundant
The land surface of the Earth receives 26,800 TW of solar radiation. About 6,200 TW are reflected back to space, much of which makes it all the way back to space, as can be seen in the famous Earthrise image taken from a spacecraft orbiting the moon. A total of 20,600 TW are absorbed on Earth’s land surface.
The electricity usage on Earth is less than 3 TW. So we only need to utilize 0.015% of the Sun’s rays to power the world. This could be achieved with solar panels over an area of the Philippines, or the state of Arizona. Sunlight is abundant. There is no need to dig up million-year-old fossil fuels as an energy source.