Learn that bacteria outweigh plants and animals
About this idea
Discover the shocking fact that the total weight of all bacteria on Earth exceeds that of all plants and animals combined! This quick microbiology lesson reveals how microbes make up most of our planet's biomass and why they're the true rulers of Earth.
On this page
How to get started
STEP 1
the numbers (3 minutes)
- Total Earth biomass:
- - Bacteria: ~70-90 billion tons (largest!)
- - Plants: ~450 billion tons
- - Animals: ~2 billion tons
- Wait - plants are more?
- But most plant mass is dead wood
- Living plant tissue: ~200 billion tons
- Living bacteria: ~70-90 billion tons
- Bacteria make up ~13% of ALL living biomass
- More than all animals combined!
STEP 2
where they live (4 minutes)
- Everywhere:
- - Soil (trillions per gram)
- - Ocean (most of ocean biomass)
- - Inside other organisms (your gut, plants, animals)
- - Deep underground (subsurface biosphere)
- - Extreme environments (hot springs, ice, deep sea)
- Most are in:
- - Ocean (marine bacteria)
- - Soil (terrestrial bacteria)
- - Deep subsurface (underground)
STEP 3
why SO many? (3 minutes)
- Tiny but numerous:
- - Single bacterium: ~1 picogram (trillionth of gram)
- - But there are quintillions of them!
- - Reproduce rapidly (some every 20 minutes)
- - Adapt to any environment
- - Been around 3.5+ billion years
- - Found life in every tested environment
STEP 4
IMPLICATIONS (2 minutes)
- Bacteria run the planet:
- - Cycle nutrients
- - Produce oxygen (cyanobacteria)
- - Decompose dead matter
- - Fix nitrogen for plants
- - Regulate climate
- We're living in the 'Age of Bacteria'
- Humans are recent additions
- Bacteria will outlast us
What you’ll need
- none
Recommended resources
Tutorials & Learning
Progress milestones
Track your progress with these key achievements:
1
5 minutes
Understand bacteria's dominance
2
8 minutes
Learn where they live
3
12 minutes
Grasp their planetary importance
Common challenges
Every beginner faces obstacles. Here's how to overcome them:
Plants seem bigger, so how are bacteria more?
Solution: Most plant mass is dead wood (not living). When you count only living tissue, bacteria make up a huge portion. Also, bacteria are everywhere - in soil, water, inside organisms - so their total mass is enormous despite being tiny.
Share your progress
Celebrate your achievements and inspire others:
- • Share this perspective-shifting fact
- • Appreciate bacteria's role in ecosystems
- • Discuss the true rulers of Earth