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Studies have shown that higher temperatures from climate change an d weather extremes will r-educe food production.But scientists are finding that rising levels of carbon dioxide and other pla-net-warming gasses t hreaten food quality.
The researchers grew rice plants in a controlled environment.They se t carbon dioxide levels t-o what scientists are predicting for our planet b y the end of the century.They found that the result-ing rice crops had lowe r than normal levels of vitarmins?minerals and prolein.The researchers sa i-d the effects of planet-warming gasses would be most severe for the po orest citizens in some of the least developed countries, mainly in Southea st Asia. These people generally eat the most ric-e and have the least com plex diet,they noted.Scientists estimated that almost 150 millionprople might be at risk of having little protein or zinc in their diet by 2050.
One of these scientists，Sam Myers of Harvard University in the Ame rican state of Massachus-ets, said the findings like this are an example o f the surprises climate change creates.“My concer-n is, there are many m ore surprises to come，” he said. Myers noted that pollution, loss of som -e species, destruction of forests, and other human activities are likely t o produce unexpected pro-blems.He said that you cannot completely chan ge all the natural systems that living organisms ha-ve grown to depend o n over millions of years without having effects come back to affect our own health.
The new study suggests a way to lower the nutritional harm of dim at e change. One way, Kob-ayashi said is to grow different forms of rice t hat have shown to be more resistant to higher carbon dioxide levels.
31 .According to Paragraph 2,who will suffer most severe effects of plane t-warming gasses?
A.The poorest citizens in Singapore.
B.Not only Chinese but also Japanese.
C.People in the United States of America.
D.People in Indonesia. Cambodia and Laos.
32. What conclusion can be drawn from what Sam Myers said?
A.Unexpected problems rarely result from human activities.
B.Poor people eat the least rice and have the most complex diets.
C.Changing natural systems may affect our own health eventually.
D.Higher temperatures from climate change-benefit food production.
33. What is the purpose of the last paragraph?
A.To advocate further research.
B.To suggest a possible solution.
C.To confirm the results of the study.
D.To promote an appropriate lifestyle.
34. What does the text mainly tell us?
A.Warming gasses increases food production.
B.Some scientific experiments have been carried out.
C.Rising levels of carbon dioxide threaten food quality.
D.The nutritional harm of climate change has been lowered.
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