CORSA
Sunglasses that don't care if you lose them.
The choice

This is your last chance.

Take the blue pill — the story ends, and you go on believing your sunglasses are saving the planet. Take the red pill, and we show you how deep the rabbit hole goes.

Learn the truthSee how deep the “sustainable” eyewear lie goes.
Stay comfortableClose this. Keep believing your shades are green.
CORSAROGUE · RUFFIAN · DEFIANT
A Corsa field guide

PHA:
THE CRASH COURSE

The bioplastic that could end the biggest lie in eyewear — and rewrite what plastic is allowed to be.

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What if I told you…

We can use bacteria to turn methane from the air into a plastic substitute.

One that could change everything — from our food system to the sunglasses on your face.

Not science fiction. It's here now. Just the dawn of a new industry.

So we're pulling back the curtain — starting with eyewear. First to market. Rewriting what “sustainable” means.

Here's how it works

Think of it like yeast.

Not literally yeast — but the same idea: yeast eats sugar and makes bread rise; these microbes eat methane and make a biodegradable plastic. Feed the bug, get a product.

💨
STEP 01

Feed them methane

Capture waste methane — a gas that would otherwise heat the planet — and pipe it to the microbes.

🦠
STEP 02

They grow plastic inside

The microbes eat the methane and store a natural plastic in their cells — the way yeast turns sugar into alcohol.

🌱
STEP 03

Harvest a real bioplastic

We extract it and shape it. When you're done, it composts back into the earth.

That plastic has a name: PHA — polyhydroxyalkanoate. (And no, that's not PFAS, the toxic “forever chemical.” One letter apart; total opposites.)

The uncomfortable truth

“Sustainable” sunglasses
don't actually break down.

Every brand sells the word. Almost none of it composts, degrades, or leaves the landfill. Better ingredients — same immortal object.

🪵

Acetate

“Plant-based cellulose.”
~40% petroleum plasticizers. Won't compost.
🌿

Bio-acetate

“Greener acetate.”
New feedstock, same forever end-of-life.
🫘

Castor-oil nylon

“Bio-based TR90.”
Durable plastic. It just never leaves.
🌊

Recycled plastic

“From ocean nets.”
Still plastic. Still sheds. Still landfill.
0%
of an acetate frame is petro-chemicals
0%
of acetate is wasted making one frame
~0
U.S. take-back recycling for frames
0%
of the market is even bio-acetate
Reset the definition

Real sustainability is an
end-of-life, not a feedstock.

🌾

Bio-based origin

Renewable carbon, not petroleum. Most “eco” frames stop here.

♻️

A real end-of-life

Actually breaks down in soil, compost, or the sea. Almost nobody crosses this line.

🕶️

Durable in use

Tough for years — degrades only when you're done. The trade-off everyone thinks is impossible.

The catch everyone expects

Tough in your bag.
Gone in the ground.

PHA only breaks down when living microbes eat it. So it's rock-solid in daily use — but has a real end-of-life once composted, buried, or lost at sea.

How fast PHA breaks down (shorter = better)

Industrial compost
Ocean water
Home compost
Garden soil
PLA & acetate

Source: peer-reviewed PHA biodegradation review, 2024. PLA needs an industrial composter; acetate effectively never composts.

Head to head

Only one material clears the bar

AcetateBio-acetateCastor TR90RecycledPLAPHA
Bio-based~~
Breaks down in soil
Home compostable
Ocean-safe
Durable daily~
Real end-of-life~
yes~ partial no
Why hasn't this happened yet?

The tech was ready.
The timing wasn't.

PHA isn't new — it's been tried before and failed on timing, not chemistry. One famous flameout built a giant plant before anyone wanted it.

0
plant capacity built in 2010
0
ever actually sold
0
written off before shutdown

What changed: plastic bans, ocean-plastic backlash, real brand demand — and methane feedstock to drop the cost. The moment finally caught up to the material.

How we make it

We grow it from a
greenhouse gas.

Our PHA manufacturer feeds captured waste methane to microbes that grow the plastic inside their cells. From nature, back to nature.

🏭

Waste methane

Captured from wastewater biogas.

🦠

Hungry microbes

Eat it, store PHA inside.

⚙️

Extract & shape

Pellets, fibers, frames.

🌍

Back to nature

Biodegrades. Loop closed.

Why the feedstock is the story

Methane traps ~80× more heat than CO₂ over 20 years. Turn it into a compostable product and the frame isn't just “less bad” — it pulls a super-pollutant out of the sky.

Carbon-negative at scale Grown from waste methane Independently certified end-of-life

Warming power vs CO₂ (20-year)

CO₂
80×
Methane
The prize bigger than eyewear

Sunglasses are the
Trojan horse.

Make a product people actually want to wear, and you make the material famous. Then the real prize opens up: food waste.

0%
of U.S. landfill is food waste
0%
of landfill methane comes from that food

Certified-compostable PHA packaging can go in the organics bin with the food that dirties it — the way Italy already does it. That's how PHA attacks landfill methane at its source.

California: extra food waste divertible with PHA-enabled collection

+20% collection
+30% collection

California landfills ~4.36M tons of food waste/yr; ~2.85M is non-donatable — prime for composting or digestion.

The Corsa move

Pull the rug out.
Plant something real.

To sell cheap sunglasses with a real conscience, we can't buy someone else's “sustainable” story. We bring the material to market ourselves — and reshape the industry by being first.

1 · Partner

Lock in our PHA supplier and secure early material.

2 · Prove

Finish durability testing + third-party end-of-life certification.

3 · Launch

Ship the first mass-market compostable sunglass — and make PHA famous.