we know, at earthwatch rivers have — age? we know, at earthwatch rivers have been _ age?cally polluted by agriculture and worsened by sewage treatment, at earthwatch we look at two macronutrients, nitrates and phosphates, at low levels in water this is perfectly normal, they are required for plant growth at high levels because algal bloom, they cause increases with the bacteria, lower levels of oxygen and it kills plants and animals in the water. nitrates and phosphates are not harmful to human health but because they come from agricultural run—off and from sewage they are indicative of other things in the water that are harmful to health like e. coli. e. coli and sewage other real concerns for people who are spending time in the water. many are pointing the finger in the uk at water companies for just illegally pouring sewage into our rivers, and sees, what is happening in france? france, in paris they _ is happening in france? france, in paris they have _ is happening in france? france, in paris they have a _ is happening in france? france, in paris they have a similar-