Many insect and parasites populations shrink during winter. With a warm winter, the ecosystem is now unbalanced, some forests will die out, some animal species

Many insect and parasites populations shrink during winter. With a warm winter, the ecosystem is now unbalanced, some forests will die out, some animal species will be ridden with ticks, etc. In the longer term, unbalanced ecosystems cause disasters like the ongoing locusts invasion in Africa.