Question

why are our biogeochemical cycles important to humans

Answer 1

The carbon cycle is one of the most important to humans because it is important to our existence:
-- one of the primary elements forming human tissues
-- necessary to plants, the basis of human food

and because it is important to the climate system which sets the background for our environment:
-- carbon dioxide (CO 2 ) and methane (CH 4 ) are greenhouse gases which help set global temperatures

Answer 2

not my work