GreenCore is VervTrip's own carbon estimation engine. It gives you a transparent, honest estimate of the footprint of a reference hotel stay. It is an estimate, not a measurement.
How your estimate is calculated
GreenCore starts from a per-night baseline for the hotel's star rating and region, then adjusts for the facilities the hotel information available to us indicates. The table below contains VervTrip’s indicative modelling assumptions, not verified emissions for individual properties or a certified environmental rating.
Model baseline kg CO₂e per night
| Region | 1-star | 2-star | 3-star | 4-star | 5-star |
|---|---|---|---|---|---|
| UK | 7 | 10 | 12 | 17 | 22 |
| EU | 5 | 7 | 10 | 14 | 18 |
| UAE | 10 | 14 | 18 | 24 | 30 |
| Other regions | 8 | 11 | 13 | 16 | 20 |
The adjustments
- +15% when the property has high-use facilities such as a spa, a pool, or multiple restaurants.
- −10% when the property carries a green certification (LEED, Green Key) or sustainability features like solar power or energy-efficient systems.
The reference estimate is the per-night figure multiplied by your selected nights. Room and guest counts, travel to the hotel, and individual energy use are not modelled. Both adjustments are applied to the original baseline; together they give a net increase of 5%.
An estimate, not an offset
GreenCore currently provides hotel estimates only. We do not sell carbon offsets or offer additional green cashback through this feature. A lower estimate does not verify that a hotel is sustainable, and no emissions have been offset by viewing or booking a stay.
A note on accuracy
Every GreenCore figure is a modelled estimate based on the assumptions above, not a measurement of the specific property. Missing or outdated hotel information affects the result. Unknown regions use the “Other regions” baseline; unrated hotels show no estimate.