Answer:
Today's global warming is happening at a much faster rate today than it did in the warm periods between ice ages over the last million years. The transition from the last ice age to the current interglacial period is estimated to have spanned 5,000 years. Humans could witness the same magnitude of global warming within a span of about 110 years. In other words, if our world warms by as much as 7°F (4.1°C) from 1990 to 2100, as some climate models project could happen, then that warming rate is about 45 times faster than the warming Earth experienced when it emerged from the last ice age.