Yes, 50 million years ago the earth was hotter. Here's why climate change is still a major problem
We've got 99 problems and CO2 is number one
By Kendra Pierre-Louis April 5, 2017
More or less what we're currently doing to the earth.
If we do nothing to reduce our carbon dioxide (CO2) emissions, by the end of this century the Earth will be as hot as it was 50 million years ago in the early Eocene, according to a new study out today in the journal Nature Communications. This period—roughly 15 million years after dinosaurs went extinct and 49.8 million years before modern humans appeared on the scene—was 16F to 25F warmer than the modern norm.
Climate change doubters often point to these earlier temperature shifts as a way of rebutting the scientific evidence that climate change is caused by human activity. And yes, less than a million years ago parts of the Midwest were covered in glaciers, while 56 million years ago the Arctic was warm enough that crocodiles roamed Greenland. All of this is true.
http://www.popsci.com/carbon-emissions-warming