Editor’s note: We were only able to air sections of Paul’s wide-ranging interview with Brazilian President Lula da Silva at the G-20 late last week. In the interest of letting viewers see Lula’s complete takes on global warming, the situation…

Paul Solman: When in Pittsburgh last week for the G-20 meetings, we interviewed Columbia University economist Jeffrey Sachs, 23 years after our first interview with him. In all these years, Sachs has been a champion of both the verities…