If you watched the entire video, he explains the effect of CO2. He doesn't believe it is causing temperature increases.
He states that from 1880 to 2013 the temperature has increased 0.3%, but the world's population has increased from 1.5 billion to 7 billion. Watch from 11 minutes to 12 minutes. He explains it, and gives the calculation.
1998 was the 'hottest year on record'. CO2 has risen slightly, and it's gotten colder.
MACS wrote: