منابع مشابه
The challenge of long-term climate change.
Climate policy needs to address the multidecadal to centennial time scale of climate change. Although the realization of short-term targets is an important first step, to be effective climate policies need to be conceived as long-term programs that will achieve a gradual transition to an essentially emission-free economy on the time scale of a century. This requires a considerably broader spect...
متن کاملthe effects of keyword and context methods on pronunciation and receptive/ productive vocabulary of low-intermediate iranian efl learners: short-term and long-term memory in focus
از گذشته تا کنون، تحقیقات بسیاری صورت گرفته است که همگی به گونه ای بر مثمر ثمر بودن استفاده از استراتژی های یادگیری لغت در یک زبان بیگانه اذعان داشته اند. این تحقیق به بررسی تاثیر دو روش مختلف آموزش واژگان انگلیسی (کلیدی و بافتی) بر تلفظ و دانش لغوی فراگیران ایرانی زیر متوسط زبان انگلیسی و بر ماندگاری آن در حافظه می پردازد. به این منظور، تعداد شصت نفر از زبان آموزان ایرانی هشت تا چهارده ساله با...
15 صفحه اولClimate change: meeting the challenge.
The debate over global warming is over. That was the implicit message of a public letter that appeared in the journal Science on May 7, 2010, signed by 255 members of the prestigious National Academy of Sciences, including Lonnie Thompson. The letter declared that ‘‘there is compelling, comprehensive, and consistent objective evidence that humans are changing the climate in ways that threaten o...
متن کاملMapping the climate change challenge
The recent negotiations on climate change in Paris have left partly open the discussion on a long-term global goal, in the form of an upper limit to warming. Agreement on such a limit is a political decision that need to be informed by scientific knowledge through a mapping that systematically explores the consequences of different policy choices. Such a multi-disciplinary effort, based on the ...
متن کاملClimate-change challenge continues
There was euphoria amongst many delegates to last month's UN climate change conference in Montreal as countries struck a deal at the twelfth hour, but many researchers are concerned that a major study on the degree to which greenhouse gases need to be reduced to stabilise climate is still pressing. " Without an agreement on what level of climate change is 'dangerous' world leaders risk losing s...
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ژورنال
عنوان ژورنال: Science
سال: 2003
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.1090858