Globally, climate change is predicted to affect liveability both directly and indirectly. Direct effects include changes in the incidence and geographical range of diseases like malaria and dengue fever. Mental health will be affected, with hot temperatures linked to poor concentration, aggressive behaviour and stress. An increase in aeroallergens and particulate matter may lead to respiratory problems and a decline in the efficacy of medication. There may be changes in precipitation that affect drinking water supplies, and increase pollutant and/or turbidly in water bodies. Agricultural profitability may change. Social cohesion may be affected as sea level rise displaces populations.