The world’s sold-out and greedy so-called ‘leaders’ may refuse to do anything whatsoever about climate change. Instead, they seem to be preparing bunkers as a solution, but for themselves only. Of course! So isn’t it high time we, as a species, stopped waiting for them for answers or action? What if we all started taking small actions individually, knowing it adds up? But what can we each do to help and take on some responsibility? How about this: digging in the dirt to make an ancient recipe, Terra Preta, the black soil of the Amazon Rain Forest. Anyone with a garden or even a potting container can do this. While you see thriving plants, the added bonus is that it’s creating a massive carbon sink if people do it in large numbers.
As you may know, Terra Preta is the soil that helped create the Lungs of the Earth in the Amazon. For 5,000 years and more, indigenous people added broken pottery, charcoal from wood fires, and organic matter to compost heaps. The term is from Portuguese for “black earth,” and the hundreds of indigenous peoples had their own way of referring to it. Similar practices of using plant charcoal in agriculture date back centuries in European farmlands.
Manhattan Project of Climate Change?
For millennia, ancient people amended the soil and planted crops in the shade of trees, something the coffee industry hopes will save it today. As a massive bonus, creating Terra Preta creates a natural means to trap carbon dioxide (CO₂). For over two decades, scientists have suggested Terra Preta’s effects at large scales could be likened to a “global Manhattan project of climate change.” In the Manhattan Project, there was a critical effort to use science to end World War II by beating the Nazi’s to build atomic weapons.
Obviously, a large effort to produce enriched biochar for Terra Preta has no comparable negative potential, but could also be important to saving the world. Even so, it’s a “simple and profitable” idea from the ancients that requires no Oppenheimer genius. It just requires you and some dirt.
Terra Preta Regenerates Itself!
While studies show that charcoal-amended soil can boost crop yields by up to 50% and total biomass yields even more, the byproducts include valuable nitrogen fertilizer, hydrogen, and ammonia. Liquid byproducts can be refined into diesel, but at a cost. But for average folks, the benefits will be a thriving garden and the knowledge that you’re doing your part for the Earth. Rather than using expensive technology, you’re just working with what Mother Earth gave you.
Remarkably, Terra Preta can regenerate itself, creating more rich black soil at the surface over time. Over years, the shards and biochar expand through the soil layers. And the microbial organisms living in the substrate help process new organic matter at the margins. Therefore, it’s dirt that makes more dirt! According to farmers’ reports, new black soil can accumulate at a rate of 1 centimeter per year. Over decades, it could even transform inhospitable desert environments too. But it does require people to make it a part of their long-term gardening routines.
Digging in the Dirt by Peter Gabriel:
Terra Preta Is Easy To Make and Use
By working with nature rather than against her, indigenous people have a positive impact on their environment. As nature rewarded them with food, they perfected a simple recipe: charcoal from smoldering wood fires, broken clay pottery, leftover food scraps and bones. Everyone contributed to the compost piles enriched with biochar. Through trial and error, they discovered that soil containing broken pottery made crops thrive even more. Most than likely, it was a happy accident.
Regardless of why, we now know the pottery shards help by aerating the soil and adding subsoil irrigation as clay wicks up moisture. If you’ve ever kept an aquarium with ceramic filter media, you’re already aware of how porous media creates a home for critical, helpful bacteria. In the soil, this pottery media has the added benefit of creating a microclimate for helpful fungi. All of these invisible communities of microbes are what make the collective thrive, just as in our own bodies, where the microbiome inhabits our digestive systems.
Like the charcoal in aquariums, Terra Preta’s biochar has tiny, sponge-like pores that trap waste and CO₂. Unlike in aquariums, it can effectively trap carbon dioxide from the air. And once you create Terra Preta, it never needs replacing – ever!
Additionally, Terra Preta boosts humus content and even helps to break down pesticides and heavy metals if present.
Make Terra Preta Nova
Since creating Terra Preta depends on local soil conditions and materials, gardeners sometimes call it Terra Preta Nova as a modern approximation for real Amazon black soil. If you already compost, you can add plant charcoal, but keep in mind it adds a lot of weight if you have a small compost bin. Biochar absorbs three times its own weight in water and nutrients.
If possible, you can make charcoal yourself. Here’s how to make biochar using a metal drum. (May not be allowed in your area; check with your local forest service or government for an open fire permit.) You can also use a fireproof container or a carefully planned fire pit, always with close adult supervision. All that’s needed is dry wood and twigs from the garden. As with any fire, take every precaution to ensure you are doing it safely and within local regulations.
Video by Gardener Scott about how to use biochar:
If making biochar isn’t possible, you can buy it, but be sure not to use barbecue charcoal, which contains chemicals. Instead, you can use horticultural charcoal sold in bags, chemical-free hardwood lump charcoal, or dedicated agricultural biochar, all sold at garden centers and hardware stores.
Aquarium Charcoal and Water
While you can also use aquarium and terrarium charcoal, it’s expensive and needs to be treated first. If you use it directly in the soil, it will pull moisture and nutrients from plants. Thus, you need to “charge” the charcoal by soaking it in organic nutrient-rich liquid like “compost tea,” fish fertilizer, manure or worm castings for at least two weeks. That way, it absorbs nutrients and microbes before going into the soil. (See the video series from Organic Gardening below for more)
Another idea from Gardener Scott on YouTube is adding your aquarium water from water changes to the charcoal in a large outdoor container or bucket for charging.
Remember, adding Terra Preta to your garden can change the soil’s pH (making it more alkaline). As with all compost, problems can sometimes arise, so don’t put prized plants in it until you’re seeing healthy plant growth for a growing season or two.
Video by Organic Gardening about charging the charcoal:
Pottery Shards, Bricks, and Lava Rocks
For the pottery shards, you can use porous, low-fired clay pottery or unglazed terracotta shards. It shouldn’t be glazed or sealed so the clay remains porous and coarse. I have seen some gardeners remark that crushed red clay bricks and lava rocks will also work. Of course, larger brick chunks would be a challenge for a garden shovel to penetrate. (Be sure lava rocks and bricks you choose aren’t contaminated with chemicals like herbicides.)
Video by The Gardening Standard:
A Carbon Sink That Lasts for Thousands of Years
As campfires smoldered in low-oxygen conditions, they turned wood, waste, and bones into biochar used for Terra Preta. And thanks to the stable molecular structure that resists decomposition, it can keep the CO₂ trapped indefinitely, even thousands of years.
“I’m talking about over 90 percent very easily surviving multi-thousands of years,” said Hamed Sanei, a professor of organic carbon geochemistry at Denmark’s Aarhus University and lead author of the paper published in the journal Biochar.
While biochar is created by human activity, it functions like inertinite, a stable organic carbon in Earth’s crust. Rather than man-made, Inertinite is fossilized charcoal created naturally by ancient paleowildfires. Like Terra Preta, it acts as a permanent carbon sink. However, there isn’t enough to serve as a primary climate solution on its own.
Thus, everyone with a garden can help by making Terra Preta soil. Just think, if it helped create the Amazon, there’s no doubt it would help! Imagine a society that actually heals the environment rather than harming it. There’s no reason we can’t return to such a way of life.
Unfortunately for now, we’re stuck with ‘leadership’ that prefers short-term profits over responding or even acknowledging the reality of climate change. So, until we see systemic changes in industry and energy, we can each do something small to help heal Earth. As we see our gardens thrive, we can also rest assured knowing we’re responding positively. As we’ve seen with Monarch butterflies, when people do small things together like planting milkweed, we can expect positive results. In 2026, Monarch butterflies covered 64% more wintering ground than the previous year. And gardeners most definitely helped by creating pollinator gardens and avoiding chemical use.
If we learn to live in harmony with nature and appreciate all it provides, we will always be rewarded. And Mother Nature can heal quickly when we all do our part.
Video by David the Good about Recreating Terra Preta:
Featured image created with AI