for gilberto jiminez and his two friends, that is reality.he vast sierra madre oriental mountain range in northeastern mexico is their home. on the way to their fields, they passed the stream. it supplies water to the entire village. but over the years, the farmers have observed unsettling changes. >> the climate keeps changing. it is becoming dryer and the water is decreasing. actually, the water in the space and should reach up to here. this one should be this high. when there is a lot of water, it bubbles out on the top and not here at the bottom. >> every year in may, the villagers erect crosses as a sign of gratitude for the water. and as a prayer that the water will stay. their fields lie on the mountain slopes. once, this was all forced area. now beans, chilies, and especially corn, the staple food, are grown here. >> the corn is for the family. we don't sell any of it. we planted and harvested as we need it. the corn is just for our own needs. >> there is no sign of irrigation on the field. the people rely on the reigns in the cloud f