While his goals were defined by a need to run a profitable business, he introduced procedures that replaced previous exploitative, earth-eroding lumbering on Saxe-Coburg's estates with practices that contained aspects of modern ecology.

His passion for precision, geomatics, and the outdoors made him the first person to disprove the results of previous measurements and accurately identify Gerlachovský štít as the highest peak in the whole 1,500 km (900 mi.)

After high school, he took special qualifying tests in forestry and spent several years gaining experience as forester in Austria and on the Lubomirski estates (administrated by the heirs of Julia Lubomirska) in Habsburg Galicia in the Łańcut and Lviv regions, now in Poland and Ukraine.

His son Ludwig Junior became chief engineer at the Coburg-Saxe estates and later forest management director at Rozsnyó (today Rožňava, Slovakia) where he was a founder of the private Girls' Institute of Education in 1871, the first high school in the Hungarian part of what was then the Austro-Hungarian Empire projected specifically for Slovak female students.

Greiner improved the effectiveness of the woodland valuation methods in the Kingdom of Hungary and trained a whole new generation of foresters in a comprehensive approach to the management of natural resources.

[10] While his goals were defined by a need to run a profitable business, he introduced procedures that replaced previous exploitative, earth-eroding lumbering on Saxe-Coburg's estates with practices that contained aspects of modern ecology.

[11] Among his lasting environmental achievements has been the restoration of the timberline on largely deforested King's Bald Mountain (Hungarian: Király-hegy, Slovak: Kráľova hoľa 1,946 m, 6,385 ft.) to its natural elevation of 1,650 m (5,413 ft).