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한국 공군은 여전히 중국·일본을 저지할 수 없다 [박수찬의 軍]

한국 공군은 여전히 중국·일본을 저지할 수 없다 [박수찬의 軍]
nate.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from nate.com Daily Mail and Mail on Sunday newspapers.

How steelmaking may go carbon-free—by dropping its addiction to coal - Bulletin of the Atomic Scientists

Steel mill interior. Image courtesy of Payton Chung under Creative Commons License Coal’s grip on the global electricity sector is loosening as more utilities and companies invest in renewable energy. But one major coal consumer the steel industry is finding it harder to kick its habit. Steel companies make nearly 2 billion tons of high-strength material every year for bridges, buildings, railways, and roads. The furnaces that melt iron ore to make steel consume vast amounts of coal. As a result, the industry accounts for roughly 8 percent of annual carbon dioxide emissions, according to McKinsey and Company, as well as a toxic soup of air pollutants.

Why the World s Top 5 Arms Sellers are All American | The National Interest

Why the World’s Top 5 Arms Sellers are All American Some will hail it as a triumph of American capitalism. Some will hail it as a triumph of American capitalism. Others will say that it is a bloodstained badge of shame. But either way, the world’s top five arms manufacturers are all American companies. The top 100 defense companies accounted for $420 billion in 2018, up 4.6 percent from 2017 and 47 higher than in 2002, according to the Stockholm International Peace Research Institute, which publishes a list of the world’s top 100 arms vendors by annual sales. “The growth in total Top 100 arms sales in 2018 was primarily driven by increases in sales by the highest-ranked companies specifically the top five companies, all of which are based in the United States,” SIPRI said. “The growth in Top 100 arms sales in 2018 can be correlated to increases in global military expenditure, particularly the rise in U.S. spending from 2017 to 2018.”

Mars, Moon & a fresh pair of eyes in the sky — the big space missions planned for 2021

Mars, Moon & a fresh pair of eyes in the sky — the big space missions planned for 2021 Among other things, the coming year will provide a glimpse at the progress being made by the burgeoning private space industry — with many new rockets set for their maiden flights. Sandhya Ramesh 1 January, 2021 12:00 pm IST A+ Bengaluru: While 2020 was defined by the Covid pandemic, astronomical and space missions continued to thrive, albeit with minor setbacks and delays. The year saw plenty of planetary findings, from Venus to the Moon to mysterious radio signals, fast radio bursts in the Milky Way, and a dimming star. 

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