2024 No Nature contact at school: The impact of an outdoor classroom on children's well-being https://pubmed.ncbi.nlm.nih.gov/30047798/ Largo- Wight, E. North America Observational Students Elementary (K-5) Green space Nature contact intervention Outdoor classroom Green school children In a 6-week crossover trial, kindergarten lessons held outdoors led to fewer behavior redirections and off-task behaviors. While children’s self-reported happiness didn’t differ, teachers observed modest well-being gains, supporting nature-based learning. 2018