A paper published today in The Holocene examines biodiversity in Romania over the Holocene [the past 11,500 years] and finds the periods with the greatest biodiversity were during the Roman Warm Period 2000 years ago, and over the past 500 years during the current warming period. Once again, the data demonstrates warming is beneficial to plant and animal life. According to the authors, "Most distinct episodes of enhanced floristic richness are evident during the Roman Period (2000 cal. yr before the present), and over the last 500 calendar years before the present."
Prior posts on biodiversity