Hardly, although there is some speculation that global warming may indeed have some affect on this. Earth’s tilt axis is also known as, “Obliquity, the angle between Earth’s equatorial and orbital planes or the tilt in Earth’s axis, which varies between 22.5 and 24 degrees during a cycle of 41,000 years. As the tilt increases, so does the annual average sunlight reaching high latitudes, and these are the conditions under which Huybers and Wunsch find that glaciations end. Earth’s tilt is currently 23.5 degrees and decreasing. Without the much more rapid anthropogenic or human influences on climate, Earth would probably be slowly moving toward glaciation.”
In addition to the small angular tilt change described in the other answer, the earth’s rotational axis precesses, meaning that while the angle stays about the same, the place in space that it points toward changes – the axis describes a circle over a time period of about 26,000 years. This means that the pole star changes – it is Polaris now, but will be (and has been) other stars over time.
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