Coast Redwoods first showed up about 200 million years ago and they eventually covered much of North America and Europe.
About 20 million years ago, as the climate changed, they went extinct in Europe and Eastern North America.
By 2 million years ago, their range was down to what we call California today.
By 1850, when commercial logging really took off, there were about 2 million acres of coast redwoods left in the world.
Between 1850 and today, we turned 95% of those old growth redwoods into lumber, shingles, railroad ties, and fence posts.
Today, the original undisturbed coast redwood forest is down to about 100,000 acres (an area half the size of New York City.)