The problem with trickledown economic theory is that we ' ve already tried it , in the U . S . at least , and it didn ' t work . I have a great aversion to trying things that historically haven ' t done what they were supposed to do . <| sep |> Buffelgrass is extremely opportunistic , extremely tough to kill off , and as you mentioned is a fire hazard . This stuff is constantly getting into our yard , and when the monsoons hit they explode , leaving me to have to dig the bastards out . The real problem with them being a fire hazard is that fire is not a part of the Sonoran desert ecosystem . Plants such as the Palo Verde tree and the saguaro cactus have no natural defenses against fire . If they get singed by flames , they ' re likely dead in short order . Forest vegetation can handle some flame since fire is part of that ecosystem , and trees can get singed by fires and be fine . Not so in the desert . Buffelgrass is a threat to reshape the entire plant ecosystem here .