Snow, trees or the air we breathe? Europe's environmental research community is facing the difficult task of settling which of the three should be the priority for Europe's next Earth-observing satellite. Around 250 Earth scientists and climate researchers will meet in Graz, Austria, this week to weigh up the scientific benefits of projects proposed for the roughly €300-mil-lion (US$390-million) seventh Earth Explorer mission of the European Space Agency (ESA).They face a choice between three projects - Biomass, PREMIER and CoReH_2O (an acronym referring to cold regions and water) - preselected through peer review from more than 20 proposals. The scientists behind the missions have been preparing their proposals for years.
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