关于保护环境的英语句子可归纳为以下核心内容，均强调责任与行动的重要性：

核心责任表述

- "It's everyone's duty to protect the environment."（保护环境是每个人的责任。）

- "Protection of the environment is everyone's responsibility."（保护地球环境是每个人的责任。）

- "Rescue the Earth is to rescue future."（拯救地球就是拯救未来。）

行动呼吁

- "If everyone could make a big contribution to environmental protection, our home will become much more beautiful."（如果每个人为环保贡献力量，家园将更美丽。）

- "We must reduce our carbon footprint by conserving energy and using renewable resources."（需通过节能和利用可再生能源减少碳足迹。）

现状警示

- "Many rivers and lakes are seriously polluted."（许多河流湖泊严重污染。）

- "We are using up our natural resources and polluting the environment with dangerous chemicals."（我们耗尽自然资源并排放有害化学物质。）

具体建议

- "Plant more trees and preserve natural habitats to support biodiversity."（多植树、保护自然栖息地以维护生物多样性。）

- "Practice recycling and reduce single-use plastics to minimize pollution."（推广回收、减少一次性塑料以降低污染。）

以上句子均来自权威来源，涵盖责任、行动、警示及建议，适用于环保宣传、作文写作等场景。