Earth experienced a swift period of intense planetary warming 56 million years ago, impacting pollinators significantly. Here's a look at those effects.

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Fifty-six million years ago, a major, sudden warming event called the Paleocene-Eocene Thermal Maximum (PETM) occurred. During this time, huge amounts of carbon entered the atmosphere, likely from a combination of volcanic activity and methane release from ocean sediments. This event resulted in a significant global warming.

A study conducted in the Bighorn Basin, Wyoming, sheds light on how plants and pollination changed during this rapid climate change. The research, published in Paleobiology, revealed that plants related to subtropical palms, silk-cotton trees, and other dry tropical climate plants increased during the PETM interval. On the other hand, wind-pollinated plants decreased during the same period.

The shift from wind pollination to increased animal pollination was a key finding of the study. Animal-pollinated plants became more common during the interval of elevated temperature and carbon dioxide. Pollinating insects and other animals likely migrated northward alongside these plants, altering flower types and pollination timing.

Interestingly, the forests that returned to the region after a long period of hot, dry climate were very similar to those that existed before the PETM. This suggests that most land species and ecological interactions seem to have survived the PETM.

Fast forward to the present day, and current greenhouse gas concentrations and global temperature are unprecedented in human history and exceed anything known in the last 2.5 million years. In the last 150 years, humans have raised atmospheric carbon dioxide concentrations by more than 40%.

The key for the future may be keeping rates of environmental change slow enough to avoid extinctions. Rapid global warming, as seen during the PETM, can have devastating effects on ecosystems. Pollinators play a vital role in fertilizing flowers, which grow into seeds and fruits and underpin our agriculture.

This article was originally published at The Conversation and was republished here under a Creative Commons license. The publication also contributed the article to our website's Expert Voices: Op-Ed & Insights.

In conclusion, the PETM provides a cautionary tale for our current climate change situation. Understanding how plants and pollinators adapted to such a dramatic climate shift can help us better prepare for the future and strive to keep environmental changes at a manageable pace.

Earth experienced a swift period of intense planetary warming 56 million years ago, impacting pollinators significantly. Here's a look at those effects.