By GEOFFREY KAVITI, CHINEDU ASADU and PAUL WISEMAN KIAMBU COUNTY, Kenya (AP) — Monica Kariuki is about ready to give up on farming. What is driving her off her 10 acres of land outside Nairobi isn’t bad weather, pests or blight — the traditional agricultural curses — but fertilizer: It costs too much. Despite thousands of miles separating her from the battlefields of Ukraine, Kariuki and her cabbage,