Abstract: Provided is a concrete edger hand-tool, including: a referencing structure comprising: a first member having a first surface oriented to face downward and bias a top-surface of a concrete form; and a second member having a second surface oriented to face substantially orthogonal to the first surface and bias a substantially vertical-side of the concrete form, wherein the referencing structure is configured to translate along a corner of the concrete form responsive to a force applied by a user edging unset concrete; and a concrete-surfacing structure coupled to the referencing structure, the concrete-surfacing structure comprising: a third member extending substantially orthogonal to the second member in a different direction from the first member, wherein the third member has a third surface configured to slide over and displace unset concrete to a depth defined by the top-surface of the concrete form.

Abstract: A method and apparatus to form and compress relatively pure carbon dioxide includes a syngas generator which forms syngas and directs it into a combustion chamber where it is combined with oxygen and combusted to form relatively pure carbon dioxide. A first portion of the formed carbon dioxide is directed to a compressor which is powered by an internal combustion engine. A second portion of the formed carbon dioxide is combined with oxygen and used in combination with a carbonaceous fuel to power the internal combustion engine. This produces exhaust gas which is relatively high purity carbon dioxide which is combined with the carbon dioxide formed by combusting the syngas.