Final answer:
Dead zones can be reduced without hurting the livelihoods of farmers upstream along the rivers by implementing stricter regulations on farming practices, promoting the use of environmentally-friendly fertilizers, creating buffer zones along the riverbanks, and educating farmers on sustainable farming techniques.
Step-by-step explanation:
Dead zones can be reduced without hurting the livelihoods of farmers upstream along the rivers by implementing stricter regulations on farming practices, promoting the use of environmentally-friendly fertilizers, creating buffer zones along the riverbanks, and educating farmers on sustainable farming techniques.