Greg Foot considers how much space it takes to grow your food. Subscribe to Earth Science for more fascinating science videos - http://bit.ly/SubscribeToEarthLab Footnotes http://www.nationalgeographic.com/what-the-world-eats/ http://qcode.us/codes/temecula/view.php?topic=17-17_24-17_24_050 https://docs.google.com/document/d/1jQ6wnBMXfippBii0exfa7qb9g5gMooZa0R2RA3lUMWY/edit?usp=sharing Watch more videos from Earth Science: Earth Science Originals http://bit.ly/EarthLabOriginals Best Of BBC Earth Videos http://bit.ly/TheBestOfBBCEarthVideos The Doctors Are In The House http://bit.ly/TheDoctorsAreInTheHouse Best Of Earth Unplugged Videos http://bit.ly/BestOfEarthUnpluggedVideos Check out the other two channels in the BBC Earth network: BBC Earth: http://bit.ly/BBCEarthYouTubeChannel BBC Earth Unplugged: http://bit.ly/BBCEarthUnplugged About BBC Earth Science: Welcome to BBC Earth Science! Always wanted to know What the world’s strongest material ? Why trains can’t go uphill? Or How big our solar system really is? Well you’ve come to the right place. Here at BBC Earth Science we answer all your curious questions about science in the world around you (and further afield too). As well as our Earth Science originals we'll also bring you the best science clips from the BBC archive including Forces of Nature with Brian Cox, James May's Things You Need To Know and plenty to keep the Docs away with Trust Me I’m A Doctor. And if there’s a question you have that we haven’t yet answered let us know in the comments on any of our videos and it could be answered by one of our Earth Science experts. Subscribe for more: http://bit.ly/SubscribeToEarthLab You can also find the BBC Earth community on Facebook, Twitter and Instagram. https://tinyurl.com/YouTube-BBCEarth-FanPanel