1st Extinction
The Ordovician Era
443 million years ago 85% of all species went extinct Reasons: An ice age“ followed by a rapid warming
2nd Extinction
The Devonian Age
374 million years ago 75% of all species went extinct Reasons: Fluctuating sea levels, altering global cooling and warming, drop in Co, concentration and periods of low oxygen
3rd Extinction
The Permian Age
250 million years ago 95% of all species went extinct Reasons: An asteroid hit the planet, filling the air with pulverised particles, leading to inhabitable climate conditions
4th Extinction
The Late Triassic Age
200 million years ago 80% of all species went extinct Reasons: Some colossal geological activity in the today's Atlantic Ocean that resulted in high CO,, global warming and acidified oceans
5th Extinction
Cretaceous Period
65 million years ago 76% of all species went extinct Reasons: Meteor crash in the Yucatan peninsula in Mexico, high volcanic activity
6th Extinction
The Holocene Epoch
About 99% of the planet's species have been lost in the previous five mass extinctions
Ongoing
Reasons: Anthropogenic factors like climate change and introduction of invasive plant species
Denne historien er fra March 16, 2022-utgaven av Down To Earth.
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Denne historien er fra March 16, 2022-utgaven av Down To Earth.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
Allerede abonnent? Logg på
A SPRIG TO CARE FOR
Punarnava, a perennial herb, is easy to grow and has huge health benefits
DIGGING A DISASTER
Soapstone mining near Dabti Vijaypur village has caused many residents to migrate.
REVIEW THE TREATMENT
Several faecal sludge treatment plants in Uttar Pradesh suffer from design flaws that make the treatment process both expensive and inefficient
MAKE STEEL SUSTAINABLE
As India works to double its GDP by 2030, its steel industry must balance growth with sustainability. By embracing policies like the Steel Scrap Recycling Policy 2019 and adopting green technologies, India is paving the way for a more sustainable future in steel production
Can ANRF pull off the impossible for India?
Anusandhan National Research Foundation is expected to reorient India's innovation goals but funding issues, old mindsets remain a drag
TROUBLED WOODS
Forests are a great bulwark against climate change. But this is fast changing. AKSHIT SANGOMLA travels through some of the pristine patches of the Western Ghats to explore how natural disturbances triggered by global warming now threaten the forest health
BLINDING GLOW
The science is clear: increased illumination has damaging consequences for the health of humans, animals and plants. It’s time governments introduced policies to protect the natural darkness and improved the quality of outdoor lighting.
GROUND REALITY
What happens when the soil loses the ability to grow healthy, high-yield crops on its own?
GM POLICY MUST BE FARMER CENTRIC
On July 23, the Supreme Court of India directed the Union government to develop a national policy on genetically modified (GM) crops for research, cultivation, trade and commerce through public consultation.
Vinchurni's Gandhi
A 96-year-old farmer transforms barren land into a thriving forest in drought-prone region of Satara
