The document discusses advocacy and food waste. Regarding advocacy, it defines advocacy as speaking on behalf of oneself or others to enact change and lists types of advocacy such as mass, ideological, and health advocacy. It notes that anyone can advocate for ideas they believe in. The document provides examples of advocacy through public opinion influencing the Vietnam War and revolutions. On food waste, it shares statistics on Singapore's food waste and approaches to reducing waste in Singapore, South Korea, and Hong Kong like donating to food banks. The presentation concludes by proposing a challenge to start a movement in one's school to cultivate a culture of clearing plates and reducing waste.