Abrupt summer sea ice decline has not affected polar bear numbers as predicted

Written by Dr. Susan J. Crockford

Yes, Arctic sea ice has declined since satellite records began in 1979 but polar bears have adjusted well to this change, especially to the abrupt decline to low summer sea ice levels that have been the norm since 2007.

Some polar bear subpopulations have indeed spent more time on land in summer than in previous decades but this had little negative impact on health or survival and while polar bear attacks on humans appear to have increased in recent years (Wilder et al. 2017), the reasons for this are not clear: reduced summer sea ice is almost certainly not the causal factor (see previous post here).

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Plummeting July 16 Temperatures In The U.S.

Written by Tony Heller

The US used to be very hot on July 16, but temperatures have plummeted. The hottest July 16 was in 1936 when afternoon temperatures averaged over 94 degrees. The only other year that happened was in 1901.

The last hot July 16 was 2006, and since then July 16 temperatures have plummeted. The coolest July 16 was in 2014, with 2015 and 2016 (NASA’s hottest year ever) also among the 20 coolest years.

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The cosmic dance of three dead stars could break relativity

Written by Joshua Sokol

Imagine you’re an astronomer with bright ideas about the hidden laws of the cosmos. Like any good scientist, you craft an experiment to test your hypothesis.

Then comes bad news – there’s no way to carry it out, except maybe in a computer simulation. For cosmic objects are way too unwieldy for us to grow them in Petri dishes or smash them together as we do with subatomic particles.

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Review: Inheritors of the Earth: How Nature is Thriving in an Age of Extinction

Written by Matt Ridley

If human beings were to vanish from the Earth, what would their effect on wildlife have been? A rash of extinctions, a lot of mixing up so that wallabies and parakeets live in England and rabbits and sparrows in Australia, but also — according to Chris Thomas — an eventual doubling in the number of species on the planet: a “sixth genesis”, as he calls it in reference to the five previous times that biodiversity has expanded rapidly after a mass extinction. We are causing a mass speciation.

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