Judith Curry
Professor of climate studies
Freeman Dyson
The first scientist to study climate in 1973, widely regarded as the greatest living scientist; studied under Feynman.
Richard Linzen
The more moderate voice.
Roy Spencer
Professor in charge of atmospheric climate measurements
David Suzuki, Climate industry spokesperson.
David Suzuki plays a scientist on TV. Here is a good example of the depth of his understanding of climate in a transcript of an interview on Australian television.