What learning to fly costs the climate: 3 to 6 tonnes of CO₂, and how to halve it

Sixty hours in a Cessna 172, at a typical cruise fuel flow, burn about 635 US gallons of avgas and put about 5.3 tonnes of CO₂ into the air. That's a bit more than a typical US car emits in a year. Sixty hours is typical for a private pilot license, and both the hours and the trainer are partly your choice.

Learning to fly has a real, measurable climate cost. At the 50 to 70 hours most US students need, a common trainer emits about 3 to 6 tonnes of CO₂, close to one person's yearly average worldwide (4.7 t in 2024). A smaller trainer and fewer, better-prepared hours can cut it by about half.

I'm Jp Valery, a private pilot with night and float ratings and 170 hours, mostly in Cessna 172s. I trained at Lachute Aviation in Quebec and got my license in spring 2024, after about 60 hours. TrimCarbon sells carbon offsets, so every number here shows its arithmetic.

How much CO₂ does a private pilot license emit?

Our arithmetic: logged (Hobbs) hours × the trainer's typical cruise fuel flow (about 75% power) × 8.31 kg of CO₂ per US gallon of avgas, combustion only. Here is how we calculate flight emissions.

The hours. The legal minimum for a private pilot license (PPL; the FAA calls it a certificate) is 40 hours under FAA Part 61, 35 at a Part 141 school, and 45 under EASA and Transport Canada rules. Few stop there. AOPA puts most US students at "somewhere between 50 hours and 70 hours".

Tonnes of CO₂ at 40 / 50 / 60 / 70 hours:

• Cessna 150/152, 58 kg an hour (7.0 US gallons, 26 litres): 2.3 / 2.9 / 3.5 / 4.1
• Piper PA-28, 77 kg (9.3 gallons, 35 litres): 3.1 / 3.9 / 4.6 / 5.4
• Cessna 172, 88 kg (10.6 gallons, 40 litres): 3.5 / 4.4 / 5.3 / 6.2

A cross-check. University of Waterloo researchers put Canadian training, from first lesson to commercial license, at about 70.4 kg of CO₂ per hour (Air, 2024): 4.2 t over 60 hours. A Waterloo blog uses a flight school's annual data for its 172: 25 litres an hour, against our 40 at cruise. A well-leaned or training hour burns less, so treat our 172 figures as the high end; your school's fuel records settle it.

For scale: the license is a one-off. The flying after it outweighs it within two years: even a 40-hour year in a 172 is 3.5 t. More in what the flying after the license adds up to and flying vs driving on a real trip.

Five ways to learn to fly with less CO₂

1. Pick the smaller trainer when it fits. A 152 emits 58 kg an hour to a 172's 88: 34% less, or 1.8 t over 60 hours. Weight and balance and your instructor's advice come first.

2. Fly often. AOPA warns: "Flying only once a week or twice a month will kill your progress." It suggests three times a week if you can. Every 10 hours you don't need in a 172 is 880 kg of CO₂, and the rental money.

3. Learn on the ground. Chair-fly the circuit (traffic pattern), brief before you walk out and practice radio calls at home. AOPA says simulator practice "can greatly reduce the time spent training in the air".

4. Learn to lean early. The 1980 Cessna 152 handbook's training procedures say to lean at any altitude at 75% power or less. AOPA says following them "can result in fuel savings of up to 13 percent": at most about 450 kg over a 60-hour license in a 152. Your POH and your school's procedures say when: see the leaning and ground-time habits in our fuel-burn guide.

5. Fly your first circuits electric, where you can. Ten hours in an electric trainer instead of a 172 save about 0.8 t (our arithmetic, with Waterloo's 90% cut).

Two students, same license (illustrative). Student A: 70 hours in a 172, once a week, 6.2 t. Student B: 50 hours in a 152, three times a week, homework done on the ground, 2.9 t. Under half the CO₂, and 20 fewer hours to pay for.

Can you learn to fly in an electric plane yet?

Checked August 2026. Yes for first lessons, not yet for a whole license.

The aircraft. The Pipistrel Velis Electro, a two-seater "intended primarily for pilot training", got the first type certificate for a fully electric aircraft from EASA in 2020.

Canada. At Sealand Flight in Campbell River, BC, students fly electric up to their first solo. Canada's first student trained only in an electric aircraft soloed there in December 2024, under a Transport Canada evaluation program, after 9.7 hours of dual instruction. Since July 2025, electric aircraft can be used for recreational permit and private license training under Transport Canada-approved programs.

United States. Since 2024, FAA exemptions have let two schools train in the Pipistrel Alpha Electro and US flight schools use the Velis Electro. Since July 2026, the FAA's MOSAIC light-sport rules allow electric propulsion without an exemption, but we found no electric trainer certificated under them by mid-August 2026.

The CO₂ and the limit. Waterloo puts an electric training hour at about 90% less CO₂ than a 172's, battery production included, and 77% less even on Alberta's coal-fired 1990 grid. But a typical endurance of 50 minutes won't fly the required 150 NM (270 km) solo cross-country, so most of a license will be flown in a fuel-burning trainer for years.

Questions to ask a flight school before you sign up

• Which aircraft will I train in, and what does it burn per hour?
• How many hours do your students take to finish, on average?
• Do instructors teach leaning early, per the POH?
• Do you have an electric trainer, or plan to get one?
• If you fund carbon credits, can I see the certificates?

When a student or parent asks your school

Students ask, and so do the parents paying. The checklist above is your prep list.

• Know your number. Average hours to license × your CO₂ per Hobbs hour, best taken from your fuel records.
• Have the answer ready. "Our students finish in about 60 hours in a 172: about [your number] tonnes of CO₂, from our fuel records." Only if true, add: "We fund the retirement of rated carbon credits for it. Here is the certificate."
• Skip "a carbon-neutral license". It overstates what credits do, and from 27 September 2026, EU rules (Directive 2024/825, applied through each country's law) will ban neutral claims based on offsetting.
• Clubs. Members can cover their own training hours, or the club its fleet: see flying clubs.
• Ask about fleet pricing. Above 15 tonnes a year, we price it with you: see flight schools or tell us about your fleet.

Questions student pilots ask

Is learning to fly bad for the environment? It has a real cost: a one-time 3 to 6 tonnes of CO₂, less than the flying after it. Whether that's acceptable is your call. Here is how I square loving flying with caring about the climate.

How much CO₂ does one flying lesson emit? About 88 kg an hour in a Cessna 172 and 58 in a 152, so a 1.5-hour lesson in a 172 is about 130 kg.

Does offsetting fix the lead in avgas? No. Lead is a local health problem, separate from CO₂, and offsets do nothing for it: see what unleaded avgas changes, and what it doesn't.

What it costs to cover the CO₂ of your license

Once you've cut what you can, here is what covering the rest costs:

• A tonne at a time: $40, one tonne per checkout, or about 11 hours in a 172. A 60-hour license in a 172 is six orders, $240.
• Once a year: a yearly plan sized to your hours and paid up front, $157 for 60 hours in a 172 or $110 in a 152. It renews each year until you cancel.
• As you train: a monthly plan sized to your pace, $15.84 a month for 5 hours in a 172.

Covering a 50- to 70-hour private pilot license with rated carbon credits costs about $96 to $183 on a yearly plan, or $120 to $280 in one-tonne orders, at our prices: under 5% of what the license itself costs ($6,000 to $20,000 or more, AOPA). Here is how the plans and per-hour prices work.

The credits come through CNaught's Impact portfolio, from projects highly rated by at least one of Sylvera, BeZero, Calyx Global or Renoster. Every order comes with your TrimCarbon certificate, listing the projects behind it. It can carry your name or stay anonymous.

To say it, with your own numbers: "I funded the retirement of 6 tonnes of rated carbon credits for my 60-hour license. The credits don't cancel the flying."

I've offset all 170 of my own hours, those first 60 included.