Not sure how long it would take to accumulate 1500 2-liter plastic bottles but if you happen to have that many piled up in your garage you have some makings for your own greenhouse.
Basic idea is you take the labels off the bottles, cut the tops off slide a pole through a hole in the bottom of the bottle, and repeat. After over a thousand iterations you have yourself a pretty cool looking greenhouse and saved most of over 1500 plastic bottles from ending up in a landfill.
This is not practical for construction for me though am considering a smaller version for a cold frame…I better start drinking up this summer.
If you want to see the full instructions check out the detailed plans.
via New World Geek