This wildebeest fossil skull was excavated at the Ledi-Geraru research site, Ethiopia. Credit: Josh Robinson In 2013, an ASU research team found the oldest known evidence of our own genus, Homo, at Ledi-Geraru in the lower Awash Valley of Ethiopia. A jawbone with teeth was dated to 2.8 million years ago, about 400,000 years earlier

the projected paths of global temperatures with a positive and negative Interdecadal Pacific Oscillation. Credit: Study authors Global temperatures could break through the 1.5°C barrier negotiated at the Paris conference as early as 2026 if a slow-moving, natural climate driver known as the Interdecadal Pacific Oscillation (IPO) has, as suspected, moved into a positive phase.

Global map of the linear trend of dissolved oxygen at the depth of 100 meters. Credit: Georgia Tech A new analysis of decades of data on oceans across the globe has revealed that the amount of dissolved oxygen contained in the water — an important measure of ocean health — has been declining for more

This is an acoustic recording station at the iconic tourist attraction Alcatraz Island in San Francisco Bay, Golden Gate National Park, California. Credit: United States National Park Service Protected areas in the United States, representing 14 percent of the land mass, provide places for respite, recreation, and natural resource conservation. However, noise pollution poses novel

Western spotted skunk. Credit: © R. C. Dowler Climate plays a key role in determining what animals can live where. And while human-induced climate change has been causing major problems for wildlife as of late, changes in Earth’s climate have impacted evolution for millions of years — offering tantalizing clues into how to protect animals

Carcharhiniformes indet. tooth from the Saltarin core, Carbonera C2 Formation, early Miocene flooding. Credit: Jorge Carrillo A tiny shark tooth, part of a mantis shrimp and other microscopic marine organisms reveal that as the Andes rose, the Eastern Amazon sank twice, each time for less than a million years. Water from the Caribbean flooded the

Tsunami warning sign (stock image). Credit: © Petr Malyshev / Fotolia A new NASA study is challenging a long-held theory that tsunamis form and acquire their energy mostly from vertical movement of the seafloor. An undisputed fact was that most tsunamis result from a massive shifting of the seafloor — usually from the subduction, or

Cloud droplets form when the amount of water vapor reaches a threshold value. Larger cloud droplets form when organic molecules (in red) are present on the surface instead of dissolving in the interior, or bulk, of the droplet. Credit: James Davies, Berkeley Lab There is enough known about cloud formation that replicating its mechanism has

Jasper Kirkby in front of the CLOUD prototype, with a sketch to illustrate the possible link between galactic cosmic rays and cloud formation. Credit: Image courtesy of CERN A novel experiment, known as CLOUD (Cosmics Leaving OUtdoor Droplets), begins taking its first data today with a prototype detector in a particle beam at CERN1, the

Natural emissions and humanmade pollutants can both have an unexpected cooling effect on the world’s climate by making clouds brighter. Credit: © Yuriy Kulik / Fotolia University of Manchester scientists, writing in the journal Nature Geoscience, have shown that natural emissions and humanmade pollutants can both have an unexpected cooling effect on Earth’s climate by

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