1.   Litter problems and a high fire risk mean that there is now restricted camping on the route.

2.   A cat, for example, may be having a litter box problem because it suffers from a bladder infection.

3.   For years, space scientists have fretted about the growing litter problem in Earth orbit.

4.   The attorney expressed concern about potential litter problems.

5.   There was a hard-hitting editorial about the litter problem in Mississippi.

6.   To deal with the litter box problem, work on making sure your garden does not resemble one.

7.   The fast-expanding information superhighway has a litter problem, an Internet expert said Tuesday.