# Carbon Shredder

> Carbon Shredder is a consumer carbon-offset service. Measure your carbon footprint, then offset it — once or with a monthly subscription — by funding a curated portfolio of high-integrity, independently-verified climate projects. Every tonne comes with a verifiable retirement certificate and registry serial number. Payments run through Stripe; carbon credits are sourced and retired via CNaught.

## Key pages
- [Home](https://carbonshredder.com/): Offset your carbon footprint once or monthly.
- [Carbon offset subscription](https://carbonshredder.com/subscription): Monthly plans that fund verified carbon credits.
- [Carbon footprint calculator](https://carbonshredder.com/calculator): A two-minute quiz that estimates your annual tonnes of CO2e.
- [Offset anything](https://carbonshredder.com/offset): Free calculators to estimate and offset flights, driving, train travel, office space and shipping.
- [Offset your flight](https://carbonshredder.com/offset/flight): Estimate and offset a flight's carbon footprint.
- [Offset your driving](https://carbonshredder.com/offset/car): Road trip and commute carbon calculator.
- [Offset your shipping](https://carbonshredder.com/offset/shipping): Freight carbon footprint calculator for air and road.
- [Free calculator widget](https://carbonshredder.com/widget): Embed our carbon footprint calculator on any website with one line of code.
- [Carbon-neutral checkout](https://carbonshredder.com/carbon-neutral-checkout): Offset every order automatically for online stores.
- [Developer API](https://carbonshredder.com/docs/api): Public HTTP API to price and buy verified carbon offsets.
- [Projects](https://carbonshredder.com/projects): The verified carbon projects your funding supports.
- [Compare the carbon footprint of food](https://carbonshredder.com/compare): Compare everyday foods by kg CO2e per kilo.

## Guides
- [How to calculate your carbon footprint](https://carbonshredder.com/how-to-calculate-your-carbon-footprint)
- [Carbon offsets 101](https://carbonshredder.com/carbon-offset-101)
- [How to track your carbon offset impact](https://carbonshredder.com/how-to-track-carbon-offset-impact)
- [Are carbon offsets real?](https://carbonshredder.com/are-carbon-offsets-real): An honest look at offset quality.
- [Methodology](https://carbonshredder.com/methodology): How we estimate footprints and choose credits.

## Facts
- Offsetting complements reducing your emissions; it is never a substitute for reducing them.
- Credits are screened for additionality, permanence, independent measurement, and no double-counting.
- Verified credits currently cost about $18 per tonne of CO2e.
- Each offset is retired once on a public registry, with a serial number customers can verify.