m72.    What are your options for dealing with hazardous materials?

Don't make them in the first place or use less harmful substitutes. Recycle or reuse them. Detoxify them. Burn them. Hide them by putting them into a deep wells, ponds, pits or landfill, or by dumping them in the ocean. These are not particularly good choices!

g16.    What is matter?

g21.    Can we mine the oceans?

e20.    What are environmental hazards and risks?