Earth and Environmental Science

Celebrating Earth Week at Penn

Organized by Penn Sustainability, Earth Week runs April 17-23 and will include dozens of events centered on the themes of environmental justice, climate, and nature-based solutions.

Katherine Unger Baillie

Climate scientist Michael Mann makes a home at Penn

Known for his “hockey stick” graph that hammered home the dramatic rise of the warming climate, the climate scientist is now making his mark on Penn’s campus, both through his science and his work on communicating the urgent need for action on the climate crisis.

Katherine Unger Baillie

Update of a local tree field guide offers ‘antidote for plant blindness’

A new edition of “Philadelphia Trees,” coauthored by former Morris Arboretum director Paul W. Meyer, Catriona Bull Briger, and Edward Sibley Barnard offers tips for identifying tree species and highlights some of the most notable trees in the region, including many on Penn’s campus.

Katherine Unger Baillie

From glacier ice, a wealth of scientific data

Biogeochemist Jon Hawkings of the School of Arts & Sciences and his lab study glaciers to understand the cycling of elements through Earth’s waters, soils, and air in its coldest regions, with implications for climate change, ecosystem health, and more.

Katherine Unger Baillie

Turning carbon emissions into rocks

In Penn’s Clean Energy Conversions Lab, researcher Peter Psarras and colleagues are repurposing waste from industrial mines, storing carbon pulled from the atmosphere into newly formed rock.

Michele W. Berger

What secrets might 2-million-year-old DNA hold?

Scientists from Denmark recently extracted and sequenced the oldest-ever DNA, from permafrost in Greenland, revealing a robust ecosystem of 135 species. Penn Today spoke with four faculty members about the potential power of ancient DNA.

Katherine Unger Baillie



In the News


WHYY (Philadelphia)

Climate policy under a second Trump presidency

Michael Mann of the School of Arts & Sciences discusses how much a president can do or undo when it comes to environmental policy.

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Salon.com

Exxon CEO wants Trump to stay in Paris climate accord

Michael Mann of the School of Arts & Sciences voices his concern about the possibility that the U.S. could become a petrostate.

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Associated Press

Amid Earth’s heat records, scientists report another bump upward in annual carbon emissions

Michael Mann of the School of Arts & Sciences says that total carbon emissions including fossil fuel pollution and land use changes such as deforestation are basically flat because land emissions are declining.

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The Independent

Climate scientists fear Trump will destroy progress in his second term – and the outcome could be ‘grim’

Michael Mann of the School of Arts & Sciences says that a second Trump term and the implementation of Project 2025 represents the end of climate action in this decade.

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NBC News

Special mud rubbed on all MLB baseballs has unique, ‘magical’ properties, study finds

A study by Douglas Jerolmack of the School of Arts & Sciences and School of Engineering and Applied Science and colleagues has uncovered the mechanical properties of the mud used to coat Major League baseballs.

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The New York Times

The science that makes baseball mud ‘magical’

A study by Douglas Jerolmack of the School of Arts & Sciences and School of Engineering and Applied Science and colleagues has uncovered the mechanical properties of the mud used to coat Major League baseballs, with additional remarks from postdoc Shravan Pradeep and Paulo Arratia.

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