European rewilding practitioners called on civil engineers and other progressive professions to join a collaborative effort to recover nature and create a wilder Europe. The online appeal in November 2019 was a response to the realisation that natural values are close to ground zero in western Europe.The reality is entering the public consciousness through media reporting of the huge declines of insects, revealed by the windscreen ‘splatometer’ test, and the plummeting numbers of once-common species reported in recent State of Nature Reports. The situation is contributing to a sense of alarm and despondency in society and anger that public institutions appear unable to turn things around.However, the call also signified a move from the defensive nature-protection logic of the twentieth century to a more confident, hopeful and innovative approach to conservation. Rewilding views nature as a force with the capacity recover if the conditions are engineered for it to do so.Upgrading ecological infrastructureRewilders need help with designing and steering new ecological infrastructure and nature-based solutions to challenges and opportunities associated with accelerating social, technological and economic change. While they have exciting and ambitious nature recovery visions, they know change requires collaboration and co-design with professionals across multiple sectors – particularly civil engineers.The global rewilding movement takes its inspiration from multiple past baselines to upgrade ecosystems within the constraints of what is possible. It is guided by the functional ecology and insight that biodiversity, bio-abundance and ecological resilience are emergent outcomes of interactions between three components of nature: trophic complexity (the ‘web-of-life), natural disturbance and natural dispersal.Ecological connectivityThe interface between the civil and ecological engineering professions has already made valuable contributions to enhancing ecological connectivity. Examples include integrating eco-bridges into linear infrastructure design, and restoring natural river dynamics to reduce flood risk and create new natural assets with recreational, identity, tourism and ecological value.There is great potential to build on this progressive practice. For example, infrastructure projects invariably involve physical disturbance of land, yet current practice is to put this right by following highly specified and site-specific ecological restoration designs. Given new understandings of the value of ‘messy chaos’ to the ecological function of landscapes, future civil engineering projects might generate a succession’ of ‘pop-up’ habitat transitions from bare-ground through scrub to woodland.More ambitiously, civil engineering could contribute to landscapes that enable the reassembly of an array of large herbivores − wild cattle, horses, deer and pigs − that are now known to be central to the web-of-life and foremost agents of ecological recovery. This would require a mix of foresight and planning that identifies connections and synergies between different projects.Decade of restorationThe United Nations has declared 2021−2030s the decade of ecosystem restoration, and the EU is expected to respond with ambition new restoration targets in its new biodiversity strategy 2030.In the UK, new environment and agricultural bills are guided by political commitments to create the first generation of people who leave the environment in a better place than they found it. Rewilders are calling on all sectors to join in creative and ambitious thinking on how to do this.This article is based on the authors’ briefing article in the latest issue (173 CE2) of the ICE Civil Engineering journal.