The hidden climate cost of booking travel—And how to fix it

From record-breaking droughts to rising sea levels, the climate crisis is no longer a distant threat but a present and accelerating emergency.

In March 2024, the United Nations’ (UN) World Meteorological Organization (WMO) confirmed that the 12-month period from March 2023 to February 2024 had an average global temperature of 1.56 degrees Celsius above pre-industrial levels, surpassing the critical 1.5 degrees Celsius threshold set in the Paris Agreement.

WMO secretary-general Celeste Saulo issued a “red alert,” calling the situation a “distress call from Earth.” UN secretary-general António Guterres reinforced the message, underscoring that climate tipping points are being triggered now, not decades from now.

Amid this global wake-up call, the tourism sector continues to grow, creating jobs and unforgettable journeys—yet also contributing heavily to greenhouse gas emissions. As the planet nears key climate tipping points, the travel industry ought to act swiftly—or, in a worst-case scenario, risk facing harsh restrictions on its very right to operate.

Travel’s carbon reckoning: A tipping point ahead

Tourism currently accounts for approximately 9% of global greenhouse gas emissions, up from around 8% pre-pandemic. International arrivals, a core metric of global travel activity, have surged back post-COVID: from 1.29 billion in 2023 (88% of 2019 levels), to an estimated 1.45 billion in 2024—nearing or even surpassing full recovery. For the first quarter of 2025, the UN World Tourism Organization (UNWTO) projects a further 5% year-over-year growth, with around 300 million international arrivals recorded in the first quarter alone.

Looking ahead, international arrivals are projected to reach 1.8 billion by 2030. While this may be a relief for an industry battered by the pandemic, it also forecasts an emissions surge.

At the same time, scientists warn that several climate tipping points—self-reinforcing feedback loops that could accelerate global warming—may already be underway. These include the melting of the Greenland and West Antarctic ice sheets, Amazon rainforest dieback and the collapse of the Atlantic meridional overturning circulation.

A 2024 study published in Nature highlighted that we are now entering a “tipping cascade” scenario as global temperatures breach the 1.5 degrees Celsius mark. If triggered, these tipping points could cause abrupt, irreversible changes with cascading consequences, including rising sea levels, extreme weather, biodiversity loss and food system disruptions.

For the travel industry, this could mean flooded coastal resorts, vanishing snow destinations and widespread disruption to natural and cultural heritage sites. As governments increasingly focus on essential versus non-essential emissions, it’s not inconceivable that travel could be restricted or taxed to protect the planet.

Offsetting should not be optional

The current practice of offering voluntary carbon offsetting at checkout is inadequate. It passes the buck to individual consumers, many of whom lack the information, motivation or trust in the system to opt in. Online travel agencies (OTAs), tour operators and travel marketplaces must recognize that they are not just intermediaries—they are enablers of travel bookings and, therefore, co-responsible for its emissions.

Climate responsibility should be built into every booking, not added as a fragile afterthought. Default carbon offsetting is not just good ethics; it is good risk management in a rapidly warming world.

What if the big OTA players got involved?

Imagine the impact if Booking.com, Airbnb, Expedia and other major OTAs began offsetting the carbon emissions of every booking made on their platforms. The ripple effect would be transformative, driving billions of dollars annually into renewable energy, reforestation, and verified carbon reduction projects. By taking the lead, these companies would not only reduce the industry’s footprint but also set a powerful precedent, accelerating the normalization of climate accountability across tourism segments. What seems radical today will be normalized—and regulatory—tomorrow.

Collective action and verified carbon standards

Critics of carbon offsetting argue that it allows businesses to avoid real reductions. And indeed, offsetting without transparency can become a form of greenwashing. But the landscape has changed. Verified standards like the Verified Carbon Standard (by Verra), Gold Standard (by the Gold Standard foundation), and platforms like the UN Carbon Offset Platform now provide mechanisms for transparency and accountability. When done right, offsetting can be a bridge toward a low-emission travel industry—one that buys us time while we work toward cleaner fuels, sustainable infrastructure and zero-emissions transportation.

Sustainability done right is good for business

Today’s eco-conscious travelers aren’t just seeking sustainability—they’re rewarding brands that prove it. And the numbers speak for themselves:

In a competitive marketplace, data-driven sustainability isn’t just responsible—it’s profitable. For travel platforms, publishing verifiable CO2 emissions data or offering built-in carbon calculators doesn’t just build trust—it differentiates. Transparency moves climate claims from checkbox to brand asset.

A call to action for the travel tech sector

What if the world’s travel platforms agreed on a shared emissions framework? What if carbon offsetting APIs were integrated across booking engines by default? The technology can quickly be put in place—what’s needed now is collective will and industry-wide collaboration. From dynamic emissions tracking to verified offset platforms, the tools are ready to scale if we act together.

Travel tech companies are perfectly positioned to lead the decarbonization of leisure, business and adventure travel. The real innovation will be in coordination, transparency and commitment. As with payment security or mobile optimization, carbon responsibility must become a basic industry standard. Leading with climate integrity will not only future-proof platforms against regulation—it will build trust, attract the next generation of customers and help secure the longevity of the very destinations we all depend on.