Here at Riled Up we pay particular attention to the major environmental issue of invasive species, critters that come from one place to become a massive weed in another. Sadly, the number of invaders is long and growing. Besides all the ecological damages they cause, controlling invasive species is very expensive. A short list of plant and animal invaders would include: the 'frankenfish' carp in the Mississippi River; feral camels in outback Australia; salt cedar along western rivers; ...