> it takes more and more fertilizer to get the same level of output We've seen a 25% increase in output over the last several years that we've only been able t

> it takes more and more fertilizer to get the same level of output We've seen a 25% increase in output over the last several years that we've only been able to explain as being the result of climate change. It is consistent across a large number of farms, so it is not one farmer's change in management practices.