That last ad was political maneuvering at its worse. Do a little research into who made that ad (hint, they are funded by Exxon, Texaco, and Ford Motors) and what that "Science" magazine they quoted really said.
Even if they got the facts right, their logic is bad: "'They' say too much co2 is bad, but we need co2 to live. Therefore they are trying to kill you."
'They' never said we should remove all the co2 from the world. Just that we need to keep it in balance. How's this logic?
"They say eating too much food is bad, but you need food to live. Therefore you should eat as much food as you possible can. Please eat 4-5 Big Macs every day because, eating is what makes us live." -- (sponsored by McDonald's)