We're not saving the Earth on our own, but we are certainly doing our part.  Our manufacturing scheme has quite a tiny carbon footprint compared to other methods of steel fabrication.  We re-purpose decommissioned propane tanks for the bulk of our product.  Compare this to smelting down those same tanks, making sheet metal rolls, shipping the material overseas where value is added, then buying the various products back here in the US.  These pressure vessels already have outstanding physical properties without any need to change their form.  The end caps that we remove are usually made into fire pits.