Hempcrete, composed of hemp fiber, lime and water, should be the building material of the future. It's mold-resistant, rot-resistant, termite-resistant, it insulates, it moderates humidity, and it's carbon-NEGATIVE, fer chrissakes. And it's stronger than shit.
You can also making clothing, plastics, fuel, and food from the hemp plant. It's the closest thing to a miracle plant we have on this beautiful planet Earth. And you can get three to four mature crops per year! Not to mention, it's close relative, cannabis, gives humans a real nice buzz while relieving pain, inflammation, and a host of other medical uses.