Zero Trace CO₂e Report — Southwest Tasmania | 8-Day Sea Kayak Expedition
Results Summary (Topline)
- Estimated total per person: ≈ 814 kg CO₂e
- Offset per person (200%): ≈ 1.63 t CO₂e
- Group total for context (12 guests): ≈ 9.77 t CO₂e
Method: high-estimate with Well-to-Tank (WTT) and aviation non-CO₂ effects via RF = 1.9; includes single-origin guest flights, all meals (included + off-tour), on-tour flights/transport & stays, and +10% uncertainty uplift.
Purpose
Conservatively estimate greenhouse gas emissions (CO₂e) across Scopes 1–3, report per person (with group totals for context), and state the 200% offset applied per person.
Key Tour Info
- Region: Southwest Tasmania (Tasmanian Wilderness World Heritage Area)
- Duration: 8 days
- Start/Finish: Hobart ⇄ Hobart (includes return scenic flights Hobart/Cambridge ↔ Melaleuca, plus Hobart city ↔ Cambridge Airport transfers)
- Group size for context totals: 12 (max 10–12 shown on page)
- Paddling distance: ≈ 85–100 km (human-powered)
- Accommodation: 7 nights wilderness camping (no grid power)
- Meals counted: 24 per person (3/day × 8; included + off-tour)
Scope & Boundaries
- Scope 1: On-tour road fuel (Hobart city ↔ Cambridge Airport shuttles).
- Scope 2: Purchased electricity only if directly attributable (typically negligible for wild camping; accommodation impact handled via room-night benchmark).
- Scope 3: Guest flights to/from Hobart (single-origin rule), on-tour scenic flights Hobart/Cambridge ↔ Melaleuca (included in the tour), accommodation (camp nights), all meals, and uncertainty uplift. Capital goods excluded.
Feeder Hub (Guest Flights) — Single Origin Rule
- Chosen origin hub: Melbourne (MEL) (nearest major capital to Hobart).
- Routing applied (return): MEL ↔ HBA for each person.
Emission Factors & Conservative Defaults
- Flights: UK GOV/DEFRA distance-based factors (economy), WTT included, RF = 1.9 applied.
- Road (mini-coach/utility): Higher passenger-km factor to reflect lower occupancy (conservative).
- Accommodation: Room-night approach (HCMI/CHSB regional benchmarks) for all 7 camp nights to avoid undercounting.
- Meals: Meat-heavy mixed-diet ≈ 2.5 kg CO₂e per meal (upper-bound).
- Uncertainty uplift: +10% added to subtotal where primary meter/fuel data is missing.
Activity Data Applied (this estimate)
- Guest flights: MEL ↔ HBA (return).
- On-tour scenic flights (included): Hobart/Cambridge ↔ Melaleuca (return).
- On-tour road: Hobart city ↔ Cambridge Airport transfers (return).
- Accommodation: 7 nights wilderness camping.
- All meals consumed: 24 meals/person.
Results — Per Person (high-estimate, no tables)
Guest flights (MEL ↔ HBA, return; WTT + RF = 1.9): ≈ 370 kg
On-tour scenic flights (Hobart/Cambridge ↔ Melaleuca, return; WTT + RF): ≈ 160 kg
On-tour road (city ↔ Cambridge transfers; conservative p-km): ≈ 10 kg
Accommodation (7 nights; room-night benchmark): ≈ 140 kg
All meals (24 × ~2.5 kg): ≈ 60 kg
Subtotal: ≈ 740 kg
+10% uncertainty uplift: ≈ 74 kg
Estimated total per person: ≈ 814 kg CO₂e
Reporting focus is per person. Group totals above are provided only for context. Offsets are applied per person.
Assumptions (transparent)
- Origin hub fixed: Melbourne for all travellers (nearest major capital to Hobart).
- Aviation: Distance-based; WTT included; RF = 1.9 to reflect non-CO₂ warming.
- On-tour flights: Treated as separate short-haul sectors (Cambridge/Hobart ↔ Melaleuca return).
- Road: Short city–airport shuttles counted with conservative passenger-km factor.
- Accommodation: Camp nights benchmarked as room-nights to avoid underestimation.
- Meals: Every meal during the 8-day window counted (24/person).
- Uncertainty: +10% uplift applied to subtotal.
Versioning
Generated 23 Aug 2025 (Australia/Perth). Factors reviewed annually or when official sources update.
References