This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The study of the relationship between the geochemistry of a region and the animal and plant life in that region.

n. The scientific study of biological, geological and chemical processes in the natural environment and especially of their mutual relationships

"Couplings between changes in the climate systems and biogeochemistry, meaning that the increase is directly attributable to human activity and can be conclusively proven as such."