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"What will a warmer, drier climate do to the legendary quality of Swiss cheese? To address this and other questions, researchers from EPFL and Agroscope Changins-Wädenswil had small flocks of sheep graze below plastic greenhouse tunnels in western Switzerland, near Yverdon. The main focus of the experiment was to study the effects of droughts on mountain pastures and their forage production. On Wednesday, September 12th, the organizers are holding an open day to present the campaign to members of agricultural institutions, researchers and the public."

Nourishing crops with synthetic ammonia (NH3) fertilizers has increasingly pushed agricultural yields higher, but such productivity comes at a price. Over-application of this chemical can build up nitrate ion (NO3-) concentrations in the soil -- a potential groundwater poison and food source for harmful algal blooms. Furthermore, industrial manufacturing of ammonia is an energy-intensive process that contributes significantly to atmospheric greenhouse gases.

Yellow starthistle already causes millions of dollars in damage to pastures in western states each year, and as climate changes, land managers can expect the problem with that weed and others to escalate.