Carbon dioxide in water meant to enhance plant growth is part of US Patents numbered 2,943,419,  3,099,898,  4,133,671,  4,632,044,  4,675,165, 5,044,117 and 5,184,420.  None of these patents define CO2 as a fertilizer.  All employ oxides of nitrogen made by internal combustion engines on tractors or stationary water pumps.  All were prepared long before CO2 sequestration was an idea.  In each case the clearly stated objective is to make a nitrogenous fertilizer solution from internal combustion exhaust with the role of carbon dioxide undefined.

As well, so little CO2 is soluble in hot water none of these include it as a component.  At best 99.86% of all these solutions would be solvent at normal pressure, but other more soluble gases would displace whatever CO2 had gone into solution.   Less than 0.145% efficiency in a delivery system is ridiculous.  These patents cannot claim even that good a result as all use hot gases that won’t dissolve in the water heated to the temperatures of internal combustion exhaust gases.  

In each patent the engine exhaust gas is either first released to the air and recaptured or released if the pressure rises more than one atmosphere in the system as it certainly will in every case.  Free release of such gases will not be allowed under expected laws.  We use captured carbon and carbon dioxide as soil amendment and fertilizer respectively with both at ambient temperature with no designed loss of either to the atmosphere.

A water delivery of one ton of carbon dioxide would require 182,188 gallons of cold water making 1,457,505 pounds of solution.   This would not only be very expensive and wasteful, but drown plants and waste an increasingly expensive, critical, and hard to obtain resource. Fresh water is the coming crisis for mankind with 70% of it now consumed in transpiration to capture carbon from air, in a very inefficient system.  We can make a better source in an act of true stewardship for the plants our planet and its’ people.