D．Life should give way to responsibility.

　　B[2012·四川卷] icted(预测)in reaction to climate change, which could have long damaging effects on food chains and ecosystems.changing some living patterns, scientists say.

　　Increased carbon dioxide(CO2)in the air from burning coal and oil can have an effect on how plants produce oxygen, while higher temperatures and changeable rainfall patterns can change their patterns of growth.

　　“Predicting species' reaction to climate change is a major challenge in ecology，” said the researchers of several ．study, published on the Nature website, uses the findings from plant life cycle studies and experiments across four continents and 1，634 species. It found that some experiments had underestimated(低估) the speed of flowering by

　　4 times.

　　“Across all species, the experiments under­predicted the speed of the advance－for both leafing and flowering－that results from temperature increases，” the study said.plants will react to climate change, it said.

　　Plants are necessary for life on the Earth. They are the base of the food chain, using photosynthesis(光合作用)to produce sugar from carbon dioxide and water. They let out oxygen which is needed by nearly every organism on the planet.and nearly 0.2℃ every ten years since 1979.

　　So far, efforts to cut emissions(排放)of planet­gh to prevent the Earth heating up beyond 2℃ this century—a point scientists say will bring the danger of a changeable climate in which weather extremes are common, leading to drought, floods, crop failures and rising sea levels.

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