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There are some extinct species — such as the woolly mammoth, shown above — that may be brought back to life if scientists can overcome some practical hurdles and thorny ethical questions. This gallery shows six of the species that researchers talked about reviving at a March 2013 forum called TEDxDeExtinction in Washington, D.C.

This photo shows a museum worker inspecting a replica of a woolly mammoth.

Thylacines, or Tasmanian tigers, were found throughout most of the Australian island of Tasmania before Europeans settled there in 1803.

Iron Ox has just opened its first fully automated farm in San Carlos, California. The company claims that their hydroponic system can produce 30 times the yield per acre of land comparing to traditional farms, while using 90% less water.

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This is Growing Underground, it’s an underground farm founded in 2012 by Richard Ballard and Steven Dring.

The farm sits inside a WWII bomb shelter. Eight of these shelters were built across London during the war, and they were each built to house around 8,000 people.

The tunnel system is 6,500m2 and Growing Underground currently only use 1/6th of the space. The farm uses hydroponic systems and LED lighting to simulate a day and night cycle.

The process takes place entirely underground, from the sowing of the seeds to the harvesting and packaging.

This is Part Three of a five-part series by Ramez Naam, Singularity University Adjunct Faculty, exploring the power of innovation to boost our access to energy, food, water, raw materials, and human population. All are based on his new book, The Infinite Resource: The Power of Ideas on a Finite Planet

In Part One and Two of this series I showed that we have access to a huge amount of potentially available energy and food on the earth, both stemming from the tremendous input of solar energy to the planet. We have very serious energy and food challenges, which cannot be dismissed. But the challenges are not in the form of a hard limit – they’re in the form of a race between innovation and consumption. Victory in this race is certainly not guaranteed. But the most important variable – how quickly we innovate – is one we can affect through our policies. That’s a topic we’ll return to at the end of this series.