The Greena Index is our core technology, developed by scientists with substantial research experience at Swansea University and the United Nations. It is based on scientific evidence incorporating three major sustainability pillars that reflect each hotel or restaurant’s level of positive impact on our planet and its people.


The 3 pillars of Greena Index:



Level of positive impact on environment

  • Combating climate change (e.g. reducing CO2 emissions and plastic waste, promoting recycling initiatives)
  • Minimising impact on biodiversity
  • Mitigating impact on natural resources (e.g. Reducing water usage and air pollution)


  • Positive impact on local communities (e.g. supporting local projects)
  • Providing and promoting gender equality and staff development opportunities
  • Fair pay and good working standards for employees



Level of positive impact on guests' health

  • Use of non-toxic cleaning products and cosmetics
  • Providing organic food
  • Providing green recreational spaces

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The Greena Levels:

Becoming sustainable is not about the final destination, but the journey. We take a step-by-step approach with hotels and restaurants, providing them with practical feedback and resources so they can continue being a force for good.

We believe that the green transition should be simple, transparent, and, above all, fun.

That's why we take pride in using technology to help the tourism sector have a lasting positive impact on our planet and its people.

Any Greena Index score between 0 and 100 is considered good, with the score difference reflecting different levels of positive impact.

Here's what the different Greena Index scores mean:

  • We welcome hotels and restaurants that express their commitment to having a positive impact on the planet, local communities, and guest well-being. These businesses are starting their sustainability journey with an expressed commitment to positive change in the way they work.

  • These businesses are already making a promising positive impact and are embarking on their sustainability journey with a strong desire for further improvement.

  • Sustainability is an important part of their business, and they are already making a great positive impact on the environment and local communities.

  • Sustainability is at the heart of their day-to-day business practices, and they make a powerful contribution to the fight against climate change, while promoting guests' well-being and supporting local communities.

  • Calculate your Greena Index


Scientific paper:

The science behind the Greena Index: Hospitality 4.0


Over the past few decades, human life has made a significant impact on our planet, triggering a new geological era, the Anthropocene [1].The Anthropocene is depicted by the human dominance of the earth [2], triggering a multitude of interrelated effects on the climate, including global warming and a major loss in biodiversity. These impacts also create substantial negative and interdependent economic and social impacts on societies. The travel and tourism industry accounted for around 10.2% of the global GDP in 2018. Around 173 million people were employed across over 700,000 hotels and resorts worldwide [3] in the Hospitality industry before the COVID-19 pandemic.

With international tourism accounting for around 5% to 8% of global GHG emissions [4] , a key opportunity to promote sustainability focused behaviours has been identified by leading researchers as smart, digital solutions, branded as ‘Hospitality 4.0’. Hospitality 4.0 encompasses technologies that boost the sector and supports and boosts its economic recovery. ... See more

  • Ruddiman, W.F. The Anthropocene. Annu. Rev. Earth Planet. Sci. 2013, 41, 45–68, doi:10.1146/annurev-earth-050212-123944.
  • Malhi, Y. The Concept of the Anthropocene. Annu. Rev. Environ. Resour. 2017, 42, 77–104, doi:10.1146/annurev-environ-102016-060854.
  • Finances Online. 109 Hospitality Statistics You Must Know: 2021/2022 Data Analysis & Market Share.
  • Lenzen, M.; Sun, Y.-Y.; Faturay, F.; Ting, Y.-P.; Geschke, A.; Malik, A. The carbon footprint of global tourism. Nat. Clim. Chang. 2018, 8, 522–528, doi:10.1038/s41558-018-0141-x.
  • Frank,A.G.;Mendes,G.H.S.;Ayala,N.F.; Ghezzi,A. Servitization and Industry 4.0 convergence in the digital transformation of product firms: A business model innovation perspective. Technol. 6.
  • Forecast. Soc. Change 2019, 141, 341–351, doi:10.1016/j.techfore.2019.01.014.
  • Ben Youssef,A.;Zeqiri, A. Hospitality Industry 4.0 and Climate Change. Circ. Econ. Sustain. 2022, doi:10.1007/s43615-021-00141-x.
  • United Nations: Department of Economic and Social Affairs United Nationas Sustainable Development Goals Available online:
  • Gielen ,D.;Boshell, F.; Saygin,D.; Bazilian, M.D.; Wagner,N.;Gorini, R. The role of renewable energy in the global energy transformation. Energy Strateg. Rev. 2019, 24, 38–50, doi:10.1016/j.esr.2019.01.006.