If atmospheric CO2 levels exceed 1,200 parts per million (ppm), it could push the Earth’s climate over a “tipping point”, finds a new study. This would see clouds that shade large part of the oceans start to break up. From a report: According to the new paper published in the journal Nature Geoscience, this could trigger a massive 8C rise in global average temperatures — in addition to the warming from increased CO2. The only similar example of rapid warming at this magnitude in the Earth’s recent history is the Paleo-Eocene Thermal Maximum 55m years ago, when global temperatures increased by 5-8C and drove widespread extinction of species on both the oceans and land.

However, scientists not involved in the research caution that the results are still speculative and that other complicating factors could influence if or when a tipping point is reached. The threshold identified by the researchers — a 1,200ppm concentration of atmospheric CO2 — is three times current CO2 concentrations. If fossil fuel use continues to rapidly expand over the remainder of the century, it is possible levels could get that high. The Representative Concentration Pathways 8.5 scenario (RCP8.5), a very high emissions scenario examined by climate scientists, has the Earth’s atmosphere reaching around 1,100ppm by the year 2100. But this would require the world to massively expand coal use and eschew any climate mitigation over the rest of this century. Further reading: A state-of-the-art supercomputer simulation indicates that a feedback loop between global warming and cloud loss can push Earth’s climate past a disastrous tipping point in as little as a century.

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Source: Slashdot – Extreme CO2 Levels Could Trigger Clouds ‘Tipping Point’ and 8C of Global Warming

You can tell a lot of things from the way someone walks. Chinese artificial intelligence start-up Watrix says its softwares can identify a person from 50 meters away — even if they have covered their face or have their back to a camera — making it more than a match for Sherlock Holmes. From a report: Known as gait recognition, the technology works by analyzing thousands of metrics about a person’s walk, from body contour to the angle of arm movement to whether a person has a toe-in or toe-out gait, to then build a database. “With facial recognition people need to look into a camera — cooperation is not needed for them to be recognized [by our technology],” said Huang Yongzhen, co-founder and chief executive of Watrix, in an interview in Beijing. Features like this have given Watrix an edge in catching runaway criminals, who tend to avoid surveillance, said Huang. Police on the streets of Beijing, Shanghai and Chongqing, have already run trials of gait recognition technology, said Huang, and the company officially launched its 2.0 version last week, which supports analysis of real-time camera feeds at a mega-city level.

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Source: Slashdot – Chinese Police Test Gait-Recognition Technology That Identifies People Based on How They Walk