How strong is the evidence for Nature Exposure?

A systematic review and meta-analysis of cohort studies in The Lancet Planetary Health found greater green space exposure is associated with lower mortality, a finding reinforced by an independent systematic review of residential green space and by a dedicated meta-analysis in older adults finding lower mortality and cardiovascular risk. That evidence is currently rated strong (74/100), built on 9 published studies, including 9 meta-analyses -- enough for real confidence in the effect.