A bad day for Younger Dryas comet impact climate theory

Studies refute hypothesis on what caused abrupt climate change thousands of years ago Two new studies in the Journal of Quaternary Science refute the hypothesis that one or more comets/bolides struck North America approximately 12,900 years ago triggering rapid climate change and the start of the Younger Dryas period. Prior to the Younger Dryas, the…

Whitby Abbey in the snow - the shell of the 13th-century church (image for illustration from Pinterest)

Cold Kills: The coldest decade of the millennium

From the EUROPEAN GEOSCIENCES UNION and the “cold kills, so why all the whining about warming?” department. How the cold 1430s led to famine and disease While searching through historical archives to find out more about the 15th-century climate of what is now Belgium, northern France, Luxembourg, and the Netherlands, Chantal Camenisch noticed something odd.…

This is a microscopic image of 2.5 billion-year-old sulfur-oxidizing bacterium.
Andrew Czaja, UC assistant professor of geology

Life before oxygen

From the UNIVERSITY OF CINCINNATI Ancient rocks hold evidence for life before oxygen Somewhere between Earth’s creation and where we are today, scientists have demonstrated that some early life forms existed just fine without any oxygen. While researchers proclaim the first half of our 4.5 billion-year-old planet’s life as an important time for the development and…

Scientists used fossilized plants, like this seed fern, to reconstruct the ancient atmospheric CO2 record from more than 300 million years ago.
William DiMichele/Smithsonian Institution

Claim: reconstructing climate from 300 million years ago from fossils says we’re in trouble now

From the UNIVERSITY OF CALIFORNIA – DAVIS What the ancient CO2 record may mean for future climate change Deep-time reconstruction shows tropical forests can deeply impact climate change The last time Earth experienced both ice sheets and carbon dioxide levels within the range predicted for this century was a period of major sea level rise, melting…


Study: lakes started oxygenation problems long before fertilizers and climate change – blame urbanization

From the INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE – INRS Urbanization: The historical cause of low oxygen conditions in European lakes The secrets lake sediments have to share A new study shows that hypoxia, i.e. low oxygen conditions, in European lakes started in 1850, becoming more widespread after 1900, long before the use of chemical fertilizers…