The decrease in winter cold effectively makes the winter shorter. While that might sound good at first, it comes with consequences for recreation, farming, and the environment. In colder climates, winter-based recreational activities, like skiing, ice fishing, and snowmobiling will become less prevalent. More disease-carrying insects, like mosquitoes and ticks, will survive through a milder winter. Declining snow pack leads to lower reservoir levels, providing less water for irrigation of crops. Fruit trees, which need to become dormant in the winter to blossom in the spring, may produce smaller yields. Pollen counts will rise, which can trigger respiratory illnesses for allergy sufferers.