Some possible benefits seemed highly speculative, the researchers conceded, based on people driving less and walking and cycling more. Other proposals studied were more concrete and achievable, such as reducing cook stoves that burn dung (粪便), charcoal and other polluting fuels in the developing world.

　　And cutting carbon dioxide emissions also makes the air cleaner, reducing lung damage for millions of people, doctors said.

　　“Here are ways you can attack major health problems at the same time as dealing with climate change，” said lead author Dr. Paul Wilkinson, an environmental epidemiologist at the London School of Hygiene and Tropical Medicine.

　　Wilkinson said the individual studies came up with numbers of premature deaths prevented or extra years of life added for certain places.

　　For example, switching to low­polluting cars in London and Delhi, India, would save 160 lost years of life in London and nearly 1,700 in Delhi for every million residents, one study found. But if people also drove less and walked or biked more, those extra saved years would soar to more than 7,300 years in London and 12,500 years in Delhi because of less heart disease.

　　1．What does the passage mainly talk about?

　　A．How can people live longer?

　　B．Cutting carbon dioxide emissions saves lives.

　　C．Global warming threatens people's lives.

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