Some diseases caused by vectors are dengue, malaria and Zika. The tick season is starting earlier and with more active ticks in a wider a range. Changing rain patterns are expanding vectors' range and their active periods. Shorter, warmer winters and longer summers are also linked to more vector-borne diseases.

Between 2030 and 2050, climate change is expected to cause approximately 250 000 additional deaths per year, from undernutrition, malaria, diarrhoea and heat stress alone.

Studies provide evidence that climate change has contributed to the expanded range of ticks,⁴ increasing the potential risk of Lyme disease, such as in areas of Canada where the ticks were previously unable to survive. The life cycle and prevalence of deer ticks are strongly influenced by temperature.