One of the authors of the new national climate assessment describes the challenges of explaining climate change to the nation in the face of "misinformation" from President Donald Trump and White House officials.

On this weekend's "Sunday Square Off," Dave White, an author of the climate report and senior sustainability scientist at Arizona State University's Julie Ann Wrigley Global Institute of Sustainability, also explains the alarming climate forecasts for Arizona and the rest of the country, and how citizens can take action.

Also on this weekend's "Square Off":

- There are new questions about an Arizona Supreme Court justice's apparently cozy relationship with Gov. Doug Ducey. Joseph Flaherty, reporter with Phoenix New Times, obtained text messages between Justice Clint Bolick and Ducey, showing Bolick giving political advice, including urging Ducey to appoint Maricopa County Attorney Bill Montgomery to a vacant U.S. Senate seat.

- "Square Off" and Arizonans remember longtime Congressman Ed Pastor, who died last week at the age of 75. As Arizona's first Latino member of Congress, Pastor nurtured a generation of Latino leaders. Services for Pastor with be Thursday and Friday at St. Francis Xavier Catholic Church in Phoenix. 

"Sunday Square Off" airs at 8 a.m. Sundays on 12 News, after NBC's "Meet the Press" with Chuck Todd.