What Sustainable Travel International does

Sustainable Travel International (legally Sustainability International, Inc.) is a Seattle-based nonprofit founded around 2004 that operates in the sustainable tourism and climate services space. It serves both individual travelers and travel-industry businesses — tour operators, destinations, and travel management companies — through a portfolio of carbon measurement, offsetting, consulting, and training services. The organization is fiscally sponsored by The Ocean Foundation and operates with a 1-10 person team, blending mission-oriented structure with multiple revenue-generating lines of activity.

The company's product surface spans consumer-facing carbon offsets for travelers, a Climate Impact Portfolio for individual climate action, and B2B offerings including Carbon APIs, Climate Action Planning, Destination Consulting, and Sustainability Training. Its most recent technical release is Humí, an AI-powered tool that measures the carbon footprint of multi-stop tours; this is delivered alongside a broader Carbon API product that enables partners to embed carbon calculation into their own booking flows. Underlying technology combines proprietary carbon-accounting methodologies for travel itineraries with generative AI applied to itinerary parsing.

The business model blends direct-to-consumer offset purchases, a paid business membership program for tour operators and tourism businesses, API licensing for partner integrations, and project-based consulting revenue for destinations and sustainability programs. Go-to-market is described as sales-led B2B combined with direct-to-consumer and an API-first channel, allowing revenue diversification across individual travelers, SMB tour operators, and enterprise travel management partners such as Internova. The leadership team includes Paloma Zapata as CEO and Brian Mullis as Founder and President.

Name

Sustainable Travel International

Legal name

Sustainability International, Inc.

Website

https://sustainabletravel.org

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

1–10 employees

Short description

Sustainable Travel International is a Seattle-based nonprofit providing carbon measurement, offsetting, and consulting services to travelers, tour operators, destinations, and travel management companies, including the AI-powered Humí tour carbon tool and Carbon APIs.

Ownership category

akta.pro rank

Product category

Sustainable Tourism Services

NAICS

Other Travel Arrangement and Reservation Services (56159)

SIC

Transportation Services (4700)

akta.pro primary industry

Carbon Footprint Measurement, Reporting & Management (Travel Emissions Accounting) (THAAANAB)

akta.pro secondary industries

Carbon Offset & Insetting Programs (Credits, Portfolios, Project Development) (THAAANAC), Sustainability & Carbon Management for Business Travel (THACAMAJ), Carbon Accounting & Sustainability Management for Travel (THALAMAK)

Keywords

• Carbon offset services
• Sustainable tourism consulting
• Travel carbon measurement
• Climate action planning
• Tourism carbon footprint API

Headquarters

HQ city

Seattle

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Carbon Offset Sales: Sale of carbon offsets to individuals and businesses to balance unavoidable travel emissions
2. Business Membership: Membership program for businesses seeking ongoing climate action support and resources
3. API Services: Transactional and measurement APIs provided to businesses for real-time carbon measurement and offsetting capabilities
4. Climate Consulting: Consulting services for destinations and businesses including sustainability training, climate action planning, and destination development

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels6 records

Core offering

Sustainable Travel International provides carbon footprint measurement, carbon offset purchasing, and climate action planning for the travel and tourism industry. Its offerings include an individual traveler footprint calculator and offset store, the AI-powered Humí tour measurement tool, a five-step Carbon Neutral Business program, climate action planning, sustainability training, destination consulting, and carbon measurement and transactional APIs for businesses. Revenue is generated through offset sales, business membership, API usage, and professional consulting services.

Product overview

Sustainable Travel International offers a portfolio of interconnected sustainability tools and services for the travel industry. The core offerings include Humí (AI-powered tour carbon measurement), carbon offset calculators for individuals and businesses, and a Climate Impact Portfolio of verified projects. The platform also provides Carbon APIs for real-time enterprise integration, Carbon Neutral Business Program (a 5-step process), Carbon Measurement Tools, Climate Action Planning, Destination Consulting, Sustainability Training, and Climate Education & Communication services. The company serves both individual travelers seeking to offset emissions and businesses/destinations looking to achieve carbon neutrality.

Differentiator

Problem solved

Functional benefit

Brands

• Humí: Tour Carbon Footprint Tool for measuring the carbon footprint of tours, hotels, and travel activities
• Carbon Neutral Business

Products and services

• Humí Tour Carbon Footprint Tool AI-powered tool that measures the carbon footprint of tours, hotels and travel activities in seconds, designed for tour operators and travel businesses.
• Carbon Offsets for Individuals Online carbon calculator and offset purchasing service that lets individual travelers measure all aspects of a trip and purchase offsets to balance emissions.
• Carbon Offsets for Business Carbon offset purchasing and measurement solutions for businesses, particularly travel and tourism companies, to address their climate impact.
• Climate Impact Portfolio Curated portfolio of verified carbon offset projects that protect nature and reduce emissions, offered to individuals, businesses, and investors as the supply behind STI's offset products.
• Carbon Neutral Business Program Five-step structured program that helps businesses measure, reduce and offset emissions to achieve carbon neutrality.
• Carbon APIs Measurement and transactional APIs that allow businesses to measure and offset carbon emissions in real time and at scale within their own systems.
• Destination Consulting Project-based consulting for destinations and tourism boards covering climate action, sustainable destination development, community engagement, and standards for sustainable resorts.
• Sustainability Training Training programs for businesses and travel professionals to build sustainability competencies and capabilities.
• Business Membership Annual membership program for businesses providing ongoing climate action support, access to tools and resources, and engagement with Sustainable Travel International's community.
• Climate Action Planning Decarbonization planning service that helps businesses design and begin executing a climate action plan on the path to net zero.

Quantifiable outcome

• Tourism accounts for 8% of global emissions - the company's market opportunity

Named customers1 record

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

AI capability1 record

Feature4 records

Partnerships

Five partnerships are on record, tiered supporting and core.

• StripesupportingOthersPCI-compliant payment processor used for online payment transactions, mentioned in privacy policy regarding SSL encryption and secure payment processing.
• PayPalsupportingOthersPCI-compliant payment processor used for online payment transactions alongside Stripe for secure payment processing.
• MailchimpsupportingTechnology or IntegrationEmail service provider used to send communications, tracking information about email interactions such as links clicked and whether messages were opened or forwarded.
• Google AnalyticssupportingTechnology or IntegrationThird-party web analytics service using cookies to collect usage information anonymously and report trends without identifying individual visitors.
• Carbon Calculator PartnerscoreChannel Partner/ Reseller/ DistributorPartners who embed STI's carbon calculators on their websites. When customers purchase offsets through these embedded calculators, customer information including name, sales total, and metric tons offset is shared with the partner. Email and payment information is never shared without express permission.

Scale indicators2 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Terrapass: Travel- and lifestyle-oriented carbon offset retailer with consumer and business offerings; overlaps with STI's individual and business offset purchasing products.
• myclimate: Swiss non-profit offering carbon offsetting and climate education with a strong travel and events focus; closely comparable mission and travel-sector specialization.
• South Pole Group: Major global carbon offset and climate-solutions provider offering portfolio management, project development, and corporate carbon strategies directly comparable to STI's Climate Impact Portfolio and business carbon offerings.
• Cloverly: Carbon-offset API platform serving travel, e-commerce, and mobility customers with embedded measurement and offsetting, directly overlapping with STI's API and calculator products.
• Patch (by Patch.io): API-first carbon-credit platform that lets businesses embed high-quality offsets into their products; competes directly with STI's transactional APIs and embedded-calculator distribution model.
• Carbonfund.org Foundation: U.S. non-profit offering carbon offsets and reduction projects to individuals and businesses, with a similar mission-driven, donation-and-offset hybrid model.
• Climate Neutral Group: Dutch-based carbon management and offset provider serving corporates with measurement, reduction, and compensation programs — comparable to STI's business carbon neutrality offering.

Emerging players

• Bookdifferent / Stayforgood: Booking platforms that surface carbon and sustainability filters on hotels and tours; compete for the same travel-sustainability discovery and labeling niche as STI's green-filter-related work.
• GreenStay.io: Travel-tech startup offering eco-certification and sustainability scoring for accommodations; intersects with STI's sustainable destination and accommodation measurement work.

Broad incumbents

• Watershed: Enterprise-grade carbon accounting and reduction platform with broad corporate coverage; a much larger incumbent expanding into travel and hospitality customers that could pressure STI's enterprise tier.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/sti_travel
• Facebookfacebook.com/sustainabletravel
• LinkedInlinkedin.com/company/sustainable-travel-international

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sustainable Travel International