This is just taking another article, summarising it, and posting the exact same pictures otherwise:<p><a href="http://www.lowtechmagazine.com/2015/12/fruit-walls-urban-farming.html" rel="nofollow">http://www.lowtechmagazine.com/2015/12/fruit-walls-urban-far...</a><p>At least in this case the original article is properly referenced, but the Low Tech Magazine version is much more elaborate and also has many links to sources.
> crops grown in heated greenhouses have energy intensity demands around 10 to 20 times those of the same crops grown in open fields. A heated greenhouse requires around 40 megajoules of energy to grow one kilogram of fresh produce, such as tomatoes and peppers<p>I don't understand this. The point of a greenhouse is that you get warmth from the sun without extra heating. Tomatoes and peppers grow in England in greenhouses and polytunnels just fine.<p>Edit: Separately the Lost Gardens of Heligan in Cornwall are very interesting. They too have greenhouses against brick walls [0]<p>[0]: <a href="http://heligan.com/explore/gardens/" rel="nofollow">http://heligan.com/explore/gardens/</a>
A great episode to kick off the Radiotopia fall fundraising campaign:<p><a href="https://www.commitchange.com/ma/cambridge/prx-inc/campaigns/radiotopia-fall-campaign-2017" rel="nofollow">https://www.commitchange.com/ma/cambridge/prx-inc/campaigns/...</a>