The document discusses several major environmental issues and disasters that have occurred over the past century. It notes that the top 10 environmental disasters have all happened in the last 100 years. Examples of issues mentioned include habitat loss, overconsumption, and species extinction caused by human activities such as deforestation and pollution. The document advocates increasing knowledge, caring about environmental issues, and taking action as ways to address these problems. It emphasizes cultivating good character and ethics to inspire positive change.