Earth

Will problems associated with environmental issues improve in the next two decades? According to an analysis of student performance on PISA 2006--an international assessment of 15-year-olds--students who are the best informed about environmental science and the geosciences are also the most realistic about the environmental challenges facing the world in the next 20 years. Meanwhile, students who are least informed in these areas are the most wildly optimistic that things will improve.

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The increase in warmer and drier climates predicted to occur under climate change scenarios has led many scientists to also predict a global increase in the number of wildfires. But a new study in the May issue of Ecological Monographs shows that in some cases, changes in the types of plants growing in an area could override the effects of climate change on wildfire frequency.

BOULDER--Rivers in some of the world's most populous regions are losing water, according to a new comprehensive study of global stream flow. The study, led by scientists at the National Center for Atmospheric Research (NCAR), suggests that in many cases the reduced flows are associated with climate change. The process could potentially threaten future supplies of food and water.

The results will be published May 15 in the American Meteorological Society's Journal of Climate. The research was supported by the National Science Foundation, NCAR's sponsor.

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