. >> manuel guerrero's water fund "agua tica," works to protect water sources by bringing together farmersnmentalists. it's supported by the german government's "international climate initiative." >> you can't drink the water from this river. it's completely contaminated. in many places, toxic chemicals are dumped into it. waste from agriculture, the breeding of livestock, waste from urban areas or industry is all discharged into the river. >> tre's no syem in plac yet toreat the wer properl and there's no system to collect and reclaim the water. >> treating the water one thing. but manuel guerrero and his partners are mainly concerned with how water is used and protecting the supply. so they work with farmers, and support their efforts to develop sustainable farming methods. that includes protecting woodlands. three decades ago, large swathes of forest were still being cleared to make way for grazing land. today, the farmers know that forests are key to protecting water sources. >> my grandfather was the first to farm this land. we've been producing milk here for around 40 years. my fathe