Without fresh water, life on land wouldn't exist. It is the most precious resource on our planet, but it's finite. Every drop is vital for all species and us humans that rely upon it.
We are continually disrupting the flow of fresh water. It no longer reaches the places that it used to and to the people and wildlife that need it. Many rivers no longer reach the sea. Mega dams block entire rivers and by taking too much water upstream we don't leave enough for those downstream. Being smart about how we farm and rethinking how we dam rivers will allow the flow to return.