Inclusion Criteria:  Experience mental health problems that are caused or exacerbated by the climate crisis and/or its consequences 18 years or older. Adequate ability to understand and speak Swedish. Access to the internet and a smartphone/computer.  Exclusion Criteria:  Other ongoing psychological treatment or counselling that interfere with trial treatment.  Recent (within the past 3 months) changes in the dose of psychotropic medication.  Any severe psychiatric or somatic conditions that would interfere with trial treatment