(A) they use methods to prevent leaks into surrounding soil and water
(B) they use treatment methods to convert wastes into harmless compost
(C) they treat waste using methods which kill bacteria
(D) once deposited, waste is never touched by humans
19 One of the problems with incineration is
(A) ozone
(B) urban heat island effect
(C) dioxins
(D) increased volume
20 Plastic is made primarily from
(A) petroleum
(B) chemicals
(C) composite materials
(D) minerals
21 The recycling logo on a plastic container indicates
(A) the container is made at least partially from recycled material
(B) the material in the container can be recycled
(C) the type of plastic used
22 The gas emitted by buried matter in landfills is primarily composed of
(A) nitrogen
(B) methane
(C) dioxins
(D) carbon dioxide
23 The Basel Convention is
(A) a ban on ozone-depleting chemicals
(B) a limit to greenhouse gases, including from landfills
(C) a ban on the disposal of toxic chemicals
(D) a ban on hazardous waste exports to developing countries
24 The largest volume of waste is in the category of
(A) municipal solid waste
(B) industrial waste
(C) construction and demolition waste
(D) hazardous waste