This Friday marks Earth Day. This year the drought and dwindling water supplies top the list of environmental challenges here in the southwest.

Scientists remain at odds over Gov. Doug Ducey’s plan to help solve Arizona’s water issues by desalinating water from the Sea of Cortez.

Ducey unveiled the idea in his State of the State address earlier this year. He proposed a $1 billion project to draw treated water to Morelos Dam near Yuma, but the challenges to the idea remain difficult to solve.