I love these sorts of stories. They make me feel like it isn't all sliding into the sewers, and the pipes are starting to back up. Basically, there's a pan-Asian boom in "Gobar Gas", which is a cute South Asian euphemism for dung-fermentation engines which produce quality biofertilizer and limited biogas for home use. The Gurkhas, who are mercenaries recruited from the back hollers of Nepal for those of you who don't really pay attention to British regimental culture, got deployed to Afghanistan, and noticed that the locals, who live in pretty much the same sort of country as back home, hadn't heard of Gobar Gas.
There's a push on to get the Afghans started on a Gobar Gas installation path - if there's a place on the planet with a greater need for fertilizer, cheap local energy, and the preservation of what few trees remain, it's back-country Afghanistan.