Who are the climate experts ?

It’s not a rare thing to meet climato-skeptic persons, but it’s like they’re slowly disappearing of the debate lately… a bit like an endangered specie ! This might be explained by the impact of the always very expected work of the Intergovernmental Panel on Climate Change (IPCC), created in 1988 to evaluate the climate evolutions on an international level. Who are those experts ? What do they say ?