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Singapore's Supertree Grove: fitted with environmental technologies that mimic the biological functions of real trees.
The Hoover Dam: capable of irrigating 2 million acres of land and powering 1.3 million homes via its 17 turbines.
The solar settlement in Freiburg produces more energy than it uses and has zero net CO2 emissions.
Andrewglaser via Wikipedia (CC BY-SA 3.0)
The Trans-Siberian Railway: spanning eight time zones, it's the world's longest railway line.
The Palm Islands, Dubai: entirely man-made from sand and rocks. A site of beauty or environmental concern?
The Millau Viaduct in France: the world's tallest bridge soaring 343 metres high!
Richard Leeming via Flickr (CC BY-SA 2.0)
International Space Station: built on Earth then assembled in space, the ISS has enabled humans to live in space since 2000!
Large Hadron Collider: largest of its kind, it tries to recreate the state of the Universe (very) shortly after the Big Bang.
Maximilien Brice via Wikimedia (CC BY-SA 4.0)
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