As part of the Great Lakes Restoration, the National Parks Service created four short 5 minute videos discussing the impact of invasive species on people and communities as well as what the general public can do to prevent their spread.
Although set in the national parks they are useful to anyone in an educational setting.
LITTLE THINGS big problems -- Emerald Ash Borer
LITTLE THINGS big problems -- Spotted Knapweed
LITTLE THINGS big problems -- Invasive Plants In Our Parks
LITTLE THINGS big problems -- Aquatic Invaders