original_query: What is the Anthropocene and when does it date from?
query: What is the Anthropocene and when does it date from?
answer: The Anthropocene is a proposed geological epoch marked by significant human impact on Earth's geology and ecosystems.  The exact start date is debated, with proposals ranging from the start of the Agricultural Revolution (12,000-15,000 years ago) to the mid-20th century (around 1950).  The Anthropocene Working Group has voted to propose a mid-20th century start date, but official ratification is still pending.