bbr is wrong again:
What is an Ice Age?
These periods are characterized by the growth and expansion of ice sheets across the Earth’s surface, which occurs every few million years.
By definition we are still in the last great ice age – which began during the late Pliocene epoch (ca. 2.58 million years ago) – and are currently in an interglacial period, characterized by the retreat of glaciers.
While the term “ice age” is sometime used liberally to refer to cold periods in Earth’s history, this tends to belie the complexity of glacial periods.
Glaciologically, ice age is often used to mean a period of ice sheets in the northern and southern hemispheres; by this definition we are still in an ice age (because the Greenland and Antarctic ice sheets still exist).
We're in middle of an Ice Age
First of all, the long-term trend for planet Earth is a cooling one. If you remember your lessons from science classes, you will recall that the Earth started out as a molten ball and over hundreds of millions of years began to cool, eventually forming a mantle or crust and creating an atmosphere and the oceans. The volcanic activity that permeated the Earth has also diminished over time, reflective of a continuing cooling. It's not a diabolical plot, rather just what happens in the life of a solar system.
Secondly, we're currently in the middle of an Ice Age. The Earth has experienced five major ice ages and this one is called the Quaternary. It has been characterized by alternating periods of glaciation averaging 70,000-90,000 years and interglacial warming periods of 10,000-30,000 years.
There have been approximately a dozen epochs of glaciation interspersed with interglacials over the last million years. Our current interglacial, the Holocene epoch, began about 12,000 years ago. At the peak of the last glaciation, about 18,000 years ago, there were ice caps and glaciers over two miles high covering Detroit and much of North America, Europe, and the southern parts of South America and Africa.