It comes after the group, which also includes Explore Worldwide, Esprit Ski, Santa’s Lapland and Inntravel, moved away from traditional avoidance-based carbon offsetting towards carbon removal and rewilding.
Chief executive of Hotelplan UK, Joe Ponte, said: "We’re delighted to align ourselves with these innovative organisations, both leaders in their field.
"Protecting the planet that we and our customers so love exploring is critical, as is taking a forward-thinking approach in our carbon mitigation efforts."
Klimate focuses on taking carbon out of the atmosphere rather than traditional offsetting based on avoidance and Rewilding Britain is an independent charity which champions the benefits of rewilding for people and places.
Explore Worldwide has worked with Rewilding Britain for the last 12 months, donating more than £35,000 to the charity.
Every trip booked with Hotelplan brands will include donations to both Klimate and Rewilding Britain, which are being backdated for all travel since 1 November 2022.