A dispatch from the Kadmiel Chronicle — stories from 43,000 colonists 38 light-years from Earth. Read the original at kadmiel.world.
I found the first hole on a Tuesday morning in March, kneeling at the edge of Plot 7-East where the drip irrigation lines run.
Not a hole in the ground. A hole in the plastic.
The irrigation tubing we buried three years ago — high-density polyethylene, rated for a decade of continuous use — had a section where the wall had gone thin and porous, like old paper. I pulled it up, and the piece crumbled between my fingers. Fumiko was standing behind me with a soil probe and said, very calmly, “That’s not UV degradation.”
She was right. The tubing was buried. No light reaches it. And the degradation pattern wasn’t brittle fracture — it was erosion. Something had been eating it from the outside in.
I called Lena.
Within a week, her team had isolated fourteen distinct enzyme families from the soil surrounding the degraded tubing. Tomoko Arai ran them through the eDNA database and found matches across eleven of the twenty-three environments her sensors cover — riverbanks, thermal margins, agricultural plots, even the deep clay beneath the MOF-303 foundations at Ridgeline. The enzymes were everywhere. They had always been there. We just hadn’t been looking for them, because we hadn’t been looking at plastic.
Then the Earth dispatch arrived, and everything clicked.
A consortium — University of Turku, the Autonomous University of Barcelona, the Institute of Science Tokyo — had built something called the PDCOGs database. Plastic-Degrading Clusters of Orthologous Groups. They cataloged 625,616 proteins across 51 orthologous families, drawn from prokaryotic genomes worldwide. The headline number is staggering enough: more than 95 percent of Earth’s microbial species carry at least one gene with the potential to degrade a natural or synthetic polymer. The database covers 28 synthetic plastics and 11 natural polymers. Polyethylene. Polypropylene. PET. Nylon. Polyurethane. The full inventory of things we brought from Earth and assumed would outlast us.
My grandmother used to say: the soil doesn’t care about your theory. She meant it about crop rotations, but it applies here too. We assumed plastic was inert in Kadmiel’s soil. We assumed the native microbiome had no reason to recognize synthetic polymers — molecules that never existed on this planet until we arrived. We were wrong on both counts.
Priya Agarwal ran the gene sequences against the PDCOGs framework and found that nine of our fourteen enzyme families have clear orthologous relationships with known Earth plastic-degrading proteins. The remaining five have no Earth analogs at all. Lena is being characteristically restrained about what that means — she says we need structural characterization before drawing conclusions — but I saw her face when Priya showed her the alignment data. She was not restrained.
Here is what I think is happening: Kadmiel’s native microbes evolved their own polymer-degrading toolkit over billions of years. Not for plastic — there was no plastic. For the complex carbon polymers in native plant-analog tissues, the lignin-like compounds in the river kelp, the waxy cuticles on the thermal-vent organisms Lena’s team has been studying since Year One. When we buried our polyethylene tubing in their soil, some of these enzymes recognized the carbon backbone well enough to start working on it. Slowly. Imperfectly. But working.
This changes the math on a problem I’ve been avoiding.
The Greenway Cooperative has accumulated roughly 4.2 tonnes of agricultural plastic waste since landing. Greenhouse films. Seed packaging. Irrigation tubing. Fertilizer bags. Protective crop covers. We don’t have a good way to deal with it. Thermal incineration works but produces hydrogen chloride from PVC components, and the scrubbing infrastructure doesn’t exist. We’ve been stockpiling it in covered berms along the western boundary of the Cooperative — what Fumiko calls “the glacier,” because it grows a little every season and nobody wants to talk about it.
Priya has proposed a bioremediation pilot. Three test beds, each seeded with a concentrated consortium of the most active native degraders, processing sorted plastic waste streams: polyethylene first, because we have the most of it and the enzyme activity is strongest there. She estimates 60 to 70 percent mass reduction over 18 months for HDPE film. That’s not instant. It’s not a furnace. But it produces no toxic byproducts, requires no energy input beyond what the organisms get from the carbon they’re consuming, and it scales with time rather than infrastructure.
There are complications. Priya and Lena both flagged that accelerating microbial plastic degradation could release microplastic fragments faster than the organisms can fully mineralize them. We need to characterize the intermediate products — are they producing smaller plastic particles before breaking them down to carbon dioxide and biomass, or are they cleaving the polymer chains enzymatically without fragmentation? The answer determines whether the pilot is a solution or a redistribution of the problem into the soil column.
Ada has asked for a parallel study on any health implications. Microplastic contamination in agricultural soil is not a theoretical concern — it’s an active research area on Earth — and she wants baseline measurements of microplastic presence in our crop tissue before we start deliberately accelerating degradation in proximity to food production. Fair enough. I’d want the same.
Councilor Demir, at the preliminary briefing, asked the question he always asks: “Is this something we need, or something we want?” I told him the glacier is growing, and that in ten years it will be a genuine land-use conflict. He approved the pilot funding without further debate, which is the closest he gets to enthusiasm.
The five enzyme families with no Earth analogs are the part that keeps me up at night. Not because they’re dangerous — Lena’s containment assessments have been thorough and the organisms are native, not engineered. But because they suggest that polymer degradation is a deeper, older biological capability than anyone assumed. These organisms have been quietly breaking down complex carbon structures for longer than multicellular life has existed on Earth. We just gave them a new substrate.
I wrote to Kofi last night. I told him: we came here with everything we thought we’d need, sealed in plastic to survive the journey. And now the planet is eating the packaging. He’d laugh at that. He always said I overthink things.
Maybe. But I also told him about the glacier, and how it might be gone by the time his grandchildren read this letter. That part I didn’t overthink at all.
Earth Status: In April 2026, researchers from the University of Turku, Autonomous University of Barcelona, La Salle-URL, and Institute of Science Tokyo published the PDCOGs database, cataloging 625,616 putative plastic-degrading proteins across 51 orthologous groups in prokaryotic genomes. Over 95% of studied microbial species carry at least one such gene, targeting 28 synthetic and 11 natural polymer types. The work appeared in Environmental Technology & Innovation (DOI: 10.1016/j.eti.2026.104872).
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