Discover and read the best of Twitter Threads about #greatoxygenationevent
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2.4 billion years ago, Earth's atmosphere was free of oxygen. Iron didn't rust! Only anaerobic species could survive.
And then ... cyanobacteria evolved photosynthesis, and began to pump oxygen into the atmosphere.
Oops.
🧵 1/n
#GreatOxygenationEvent
en.wikipedia.org/wiki/Great_Oxi…
And then ... cyanobacteria evolved photosynthesis, and began to pump oxygen into the atmosphere.
Oops.
🧵 1/n
#GreatOxygenationEvent
en.wikipedia.org/wiki/Great_Oxi…
Suddenly, iron dissolved in the oceans bonded with oxygen and precipitated, forming layers of rust on the ocean floor. The deposits got thicker and thicker, reaching 100s of meters. 60% of iron is mined from these layers! 2/n
#bandedironformations
en.wikipedia.org/wiki/Banded_ir…
#bandedironformations
en.wikipedia.org/wiki/Banded_ir…
Methane was no longer stable: it reacted with oxygen to form CO2. Methane is a far more powerful greenhouse gas - so dropping methane levels triggered sudden cooling. The Earth froze over, with glaciers reaching as far as the tropics. 3/n
#snowballEarth
theconversation.com/billions-of-ye…
#snowballEarth
theconversation.com/billions-of-ye…
Daily Bookmarks to GAVNet 04/21/2021 greeneracresvaluenetwork.wordpress.com/2021/04/21/dai…
Planting the Anthropocene’s roots in globalization-Book Review by Wolfgang Lucht
nature.com/articles/d4158…
#anthropocene #globalization #history
nature.com/articles/d4158…
#anthropocene #globalization #history
Lumber frenzy drives up home prices as suppliers can't keep up
bloomberg.com/news/articles/…
#HomePrices #LumberShortages #ConstructionCosts
bloomberg.com/news/articles/…
#HomePrices #LumberShortages #ConstructionCosts
Most life needs oxygen now but it killed most life two billion years ago! Algae turned sunlight into energy for the first time (called photosynthesis) and made oxygen as waste. It was toxic to the anaerobic (no oxygen) bacteria that were most life on earth then.
#nspoli #cbpoli
#nspoli #cbpoli
We know about the #GreatOxygenationEvent thanks to geology. The fossil record tells us a mass extinction took place and that O2 in the atmosphere caused rapid changes in the evolution of life: it helped multi-cellular life form and thrive. Without it, we wouldn't be here!
#nspoli
#nspoli
