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Both halves of the $10 billion James Webb Space Telescope, scheduled to launch in March 2021, have been assembled.  The milestone is a result of the efforts of thousands of dedicated individuals for over more than 20 years.  The JWT will orbit the Sun, not the Earth.

https://www.space.com/nasa-james-webb-space-telescope-complete.html

Researchers from the Australian National University (ANU) have broken new ground in solar cell energy efficiency and in the process provided a glimpse of the technology’s future. The researchers have a set a new record of 21.6 percent efficiency, the highest ever achieved for perovskite cells above a certain size.

https://techxplore.com/news/2019-08-solar-next-gen-cells.html

Barite from the Belcher Islands in Canada contain a record of oxygen in the Earth’s atmosphere from 2 billion years ago.

via Ancient die-off greater than the dinosaur extinction.

Work has started in Scotland to build what is described as the world’s most powerful floating tidal turbine.

https://www.bbc.com/news/uk-scotland-north-east-orkney-shetland-49471881

NASA maps carbon monoxide from #AmazonRainforest fires from orbit: https://t.co/xFvWUfDfVm pic.twitter.com/eRrp34QvGm

— NASA JPL (@NASAJPL) August 23, 2019