wood is used as a heating fuel for many households

heating with firewood produces dangerous air pollution

people with respiratory diseases may be affected by wood smoke

temperature inversions increase the danger of wood smoke pollution

illustrate the dangers posed by air pollution

establish that air pollution is caused by humans

clarify the meaning of "very small particles"

invite a debate on the causes of wood smoke

methods must be developed to permit wood heating in urban areas

a well-managed woodlot can produce enough fuel to heat a single house

supplies of fossil fuels such as oil and coal will eventually be exhausted

firewood is a sustainable resource for much home heating

may not be familiar with the measuring of firewood

are thinking of converting from fossil fuel to wood heat

need more information about sustainability practices

want to harvest firewood from woodlots that they may own

Both authors agree that pollution from wood heating is a serious problem.

The authors disagree about the seriousness of the effects of pollution from wood smoke.

The author of Passage 2 does not contradict Passage 1 but highlights an

advantage of wood heat.

The author of Passage 2 believes that the problem of wood smoke can be solved by good sustainability practices.

Burning fossil fuels for home heating generates pollution that is just as serious as that produced by wood heating.

By heating with firewood, homeowners are able to cut and prepare fuel themselves, thereby saving substantial fuel costs.

The cost of firewood for heating fuel is likely to remain fairly stable while the

prices of fossil fuels change dramatically.

Heating with firewood became widespread during the 1970s when there were severe shortages of oil.