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not really seen _ explains. iowa's water quality has not really seen significant - not really seen significant improvements in the last decade or so. improvements in the last decade or so in _ improvements in the last decade or so in fact, — improvements in the last decade or so. in fact, some trends show the levels _ so. in fact, some trends show the levels of— so. in fact, some trends show the levels of nitrate in our waters is actually — levels of nitrate in our waters is actually getting worse. and unfortunately, we know that has negative — unfortunately, we know that has negative health impacts. iowa is the -- plays— negative health impacts. iowa is the -- plays the— negative health impacts. iowa is the —— plays the second—highest cancer in the _ —— plays the second—highest cancer in the country, and the only state to have _ in the country, and the only state to have a — in the country, and the only state to have a rising cancer rate. we don't _ to have a rising cancer rate. we don't know_ to have a rising cancer rate. we don't know exactly the cause of that but, don't know exactly the cause of that but. as— don't know exactly the cause of that but. as we _ don't know exactly the cause of that but, as we are looking to determine that because, we do know that high levels _ that because, we do know that high levels of— that because, we do know that high levels of nitrate do increase risk factors — levels of nitrate do increase risk factors for— levels of nitrate do increase risk factors for cancers and birth defects- _ factors for cancers and birth defects— so prioritising land protection that improves our water quality— protection that improves our water quality is _ protection that improves our water quality is a — protection that improves our water quality is a critical task for us to undertake — quality is a critical task for us to undertake and address public health concerns, _ undertake and address public health concerns, as well as the environmental impacts. in concerns, as well as the environmental impacts. in the last 30 ears, environmental impacts. in the last 30 years. farm _ environmental impacts. in the last 30 years, farm consolidation - environmental impacts. in the last 30 years, farm consolidation has l 30 years, farm consolidation has meant the number of pig farmers has reduced by 80%, making it harder to make a living. chad hart is a professor of economics at iowa state