A new map of climate conditions during the Pliocene epoch—the last time Earth’s carbon dioxide concentrations hit 400 parts per million—could offer clues about possible climatic changes in store for the 21st century.

Aaron Sidder
Aaron Sidder is a freelance writer based out of Denver, Colo. He has a master’s degree in ecology from Colorado State University. Aaron was an AGU-sponsored AAAS Mass Media Science & Engineering Fellow at National Geographic in 2016, and he has been writing for Eos ever since. In addition to Eos and National Geographic, he has written for National Geographic Kids Magazine, Smithosonian Smart News, 5280 Magazine, and the Santa Fe Institute. In his free time, he cultivates an extensive—and growing—collection of field guides from around the country.
How Could Solar Climate Intervention Strategies Affect Agriculture?
Geoengineering approaches such as stratospheric aerosol injection hold the promise of limiting warming, but among the many potential risks and concerns, their impacts on agriculture remain largely unexplored.
Getting to the Bottom of Cenozoic Deep-Ocean Temperatures
Reconstructing past ocean conditions with oxygen isotopes could provide more information about how Earth’s climate evolved over time, but methods for reconstructing these data can yield varying results.
Dry Heat, Wet Heat, and Wetland Methane Emissions
Compound weather events—such as extreme cold or heat combined with severe dryness or precipitation—have a greater effect on wetland methane emissions than discrete weather extremes do.
Insights Biogeoquímicos de um Importante Rio Amazônico
Sub-representados nos orçamentos globais de carbono, rios tropicais como o Tocantins, no Brasil, necessitam de estudos para estabelecer suas características de base face às crescentes mudanças globais.
Down in the Slumps: Tracing Erosion Cycles in Arctic Permafrost
Climate change is altering permafrost thaw cycles and leading to unique Arctic erosional problems.
The Unexpected Role of Magnetic Microbes in Deep-Sea Mining
A new study highlights the co-occurrence of magnetic bacteria and polymetallic nodules and may offer insights into how the mineral-rich nodules form on the ocean floor.
Scientists Present Europe’s New Greenhouse Gas Budget
The greenhouse gas budget developed for Europe highlights carbon sources and sinks across the continent and will serve as a baseline for years to come.
How Mantle Hydration Changes over the Lifetime of a Subduction Zone
Water released from subducting oceanic plates influences the formation of volcanoes and earthquakes on Earth’s surface. A new study simulates how slab dehydration and mantle hydration levels change over time.