Actually, we are quite overdue for a full fledged Ice Age. Past interglacial warm periods were less than 10,000 years, this one is 12,000 years. Based on the established natural cycle, the Little Ice Age should have been the start of the new ice age. Something seems to have interrupted the natural cycle.
Image based on data from the National Oceanographic and Atmospheric Administration.
Global temperature variation for the past 425,000 years. The present is at the right. The horizontal 0 line represents the 1961–990 average global temperature. The numbers on the left show the variation from that baseline in °C.
The data were derived from an analysis of ice cores taken at the Vostok station in Antarctica.