1.   In many wealthy countries, waste is the environmental problem that people care about most.

2.   In the past, waste was not useless, but provided fuel, building materials and industrial materials, as well as rough grazing.

3.   Low-level waste is primarily the product of industrial and medical use of radioactive substances.

4.   Nuclear waste is disposed of at much shallower depths.

5.   Sometimes they are not even informed that the waste is hazardous before it arrives on their doorstep.

6.   This is because higher level waste is initially rich in short-lived isotopes which are highly radioactive.

7.   Waste from animals was a valuable fertiliser - all you had to do was to plough it into the land.

8.   Waste from animals is a valuable fertilizer all you have to do is plough it into the land.