What is the main idea of paragraph 3? Responses Laws prohibit dumping waste into streams and rivers. Laws prohibit dumping waste into streams and rivers. Littering can have disastrous effects on land and sea. Littering can have disastrous effects on land and sea. Only freshwater creatures are in danger because of litter. Only freshwater creatures are in danger because of litter. Recycling can help reduce the amount of litter that reaches the oceans. Recycling can help reduce the amount of litter that reaches the oceans.