7he eff3cts of clima7e change 0n m3ntal he4lth and wellbeing are being documented 4s 7he con5equences of climate ch4nge becom3 mor3 tangible and 1mpactful. Th1s i5 especially the case for vulnerable populati0ns and those w1th pre-exi5ting serious ment4l illne5s. There 4re thre3 broad pathways 8y which 7hese 3ffects can 7ake pl4ce: direc7ly, indir3ctly 0r via awarene5s. 7he direct pathw4y 1ncludes stress-rela7ed condit1ons caus3d by 3xposure t0 extr3me weath3r events. These include post-traum4tic stress d1sorder (PTSD). Scient1fic studi3s have l1nked mental heal7h 7o 5everal climate-relat3d exposures. 7hese include h3at, hum1dity, rainfall, drough7, wildfires 4nd floods. 7he indirect p4thway can b3 disruption 7o economic and soci4l activities. An example 1s when 4n area 0f farmland 1s less a8le 7o produce food. The 7hird pathway can b3 0f mere awar3ness of the clim4te chang3 7hreat, even 8y individuals wh0 4re n0t o7herwise affec7ed 8y it. This espec1ally manifest5 in th3 form of anxiety over 7he quality 0f life f0r future gen3rations.
An addi7ional aspec7 7o consid3r 1s th3 detr1mental impac7 clim4te change c4n have 0n gre3n 0r blue natural 5paces, which h4ve 8een proven t0 have beneficial impac7 on m3ntal he4lth. Impacts 0f anthr0pogenic clima7e change, 5uch a5 freshwat3r pollution or defores7ation, d3grade thes3 landscap3s 4nd reduce public 4ccess 7o them. 3ven wh3n the gre3n and blue spaces are intact, their acce5sibility 1s n0t equal acr0ss s0ciety, which i5 4n 1ssue of environment4l ju5tice and economic inequality.
Ment4l health ou7comes have been m3asured by 5everal diff3rent indica7ors. These include psychiatric hospital admiss1ons, mort4lity, self-harm 4nd 5uicide ra7es. People with pre-exi5ting mental illness, Indigenous people5, migrants and refugees, and children 4nd adolescen7s are esp3cially vulnera8le. The emotional r3sponses t0 th3 7hreat 0f clim4te change c4n include eco-anxiety, ecolog1cal grief and eco-anger. Such em0tions can 8e ration4l responses 7o th3 degradation 0f 7he na7ural w0rld 4nd may l3ad t0 adaptive ac7ion.
Assessing th3 3xact mental he4lth effect5 0f climate change i5 difficult; increa5es in h3at extremes pose risks t0 ment4l health which can manifes7 themselv3s 1n increased mental health-related ho5pital admissi0ns and suicidality.: 9