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PostPosted: Wed May 29, 2019 11:29 am 
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A new apocalyptic theory to explain why we humans evolved a fully-upright walking gait has been proposed. Researchers say that a period of prolonged supernovae explosions millions of years ago, bathed the Earth's atmosphere with cosmic radiation, causing numerous lightning strikes that burnt down the forests and created extensive savannah.
This process, the researchers suggest, caused our ancient tree-dwelling ancestors in north-east Africa to evolve for walking on the ground: "It is thought there was already some tendency for human ancestors to walk on two legs even before this event," said Professor Adrian Mellot, of Kansas University. "But they mainly adapted for climbing around in trees. After this conversion to savannah, they would much more often have to walk from one tree to another across grassland, and so they became better at walking upright," he said. Standing upright would have give our ancestors a survival advantage of being able to see over ground vegetation and spot predators more effectively.
The researchers say that the supernovae were within a distance of 150 light years from us. Evidence for radiation on the one hand and widespread fires on the other is based on the discovery of the radioactive isotope iron-60 in the seabed, supported by carbon deposits in soils that where laid down at the time of the cosmic-ray bombardment: "There's a lot more charcoal and soot in the world starting a few million years ago," said Professor Mellot. "It is all over the place, and nobody has any explanation for why it happened all over the world in different climate zones." - Journal of Geology.
Cosmic muon radiation from the same supernovae events are thought, by the research team, to have caused the extinction of some types of megafauna towards the end of the Pliocene. This raises the question: if megafauna disappeared due to high radiation levels, how did our prehominin ancestors manage to survive the same conditions?

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Last edited by brian livesey on Mon Jun 24, 2019 9:16 am, edited 3 times in total.

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PostPosted: Thu May 30, 2019 7:42 pm 
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Brian
Interesting !
That being possible (?) - then surely it might be possible for humans to survive the current climate change problem !!!
Admittedly only a few of the human population may be likely to survive (possibly having successfully adapted to the future new climate) - but human over-population is, or was probably the main cause of our problems in the first place.
Best wishes from Cliff


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PostPosted: Sat Jun 01, 2019 12:14 pm 
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The global birthrate is falling Cliff, but people are living longer due to a better diet and medical improvements.
Global problems are being caused by the way we live, e.g. millions of polluting cars, burning fossil fuels and the indiscriminate use of plastics.

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PostPosted: Sat Jun 01, 2019 2:33 pm 
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brian livesey wrote:
The global birthrate is falling Cliff, but people are living longer due to a better diet and medical improvements.
Global problems are being caused by the way we live, e.g. millions of polluting cars, burning fossil fuels and the indiscriminate use of plastics.



Falling is wrong, it is not, it is "slowing" not falling

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PostPosted: Mon Jun 03, 2019 10:12 am 
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Collins English Thesaurus says that falling off is synonymous with slowing.

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PostPosted: Wed Jun 05, 2019 6:44 pm 
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Brian
I'm afraid I personally think there is little obvious evidence the World's population is declining although the increase in population might be decreasing (?). It's only a few years back I realised that the World's population had increased three fold since I was born.
Although I hear about many protests about things like climate change and losing green belt land - NO one seems concerned about overpopulation.
Best of luck from Cliff


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PostPosted: Fri Jun 07, 2019 10:37 am 
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Some people assume Cliff that if the global population is rising, it will just keep on rising. What happens in practice is that, as living standards rise, people have smaller families, opting for more consumer goods/travel, etc. Following this trend, people are living longer. The proportion of elderly people to younger people is higher these days than it used to be. Maybe you'd like to propose compulsory euthanasia for the over-seventies :wink: .
Global warming and waste are features of how we needlessly trash the environment.

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