World risks 'collective suicide', UN chief warns climate summit

The UN's chief warned Monday that nations must cooperate or face "collective suicide" in the fight against climate change, at a summit where developing countries reeling from global warming demanded more action from rich ...

Cover crops can lower yields, according to new study

The promise for American agriculture is tantalizing: healthier soil, more carbon kept in the ground, less fertilizer runoff, and less need for chemicals. The reality of planting cover crops during the off-season—a much-touted ...

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