The 3R system presentation discusses the topics of reduce, reuse, and recycle. It explains that reduce means to make something smaller or use less to create less waste. Reuse involves using items again or more than once to extend their lifespan. Recycle converts materials into reusable materials through a process that allows them to be used again. The benefits of recycling are that it reduces the need for landfilling and incineration, prevents pollution, saves energy, and conserves natural resources. The presentation encourages practicing all three of the 3Rs - reduce, reuse, and recycle - every day for a healthy environment.