Let us talk about climate in 30 questions

By proposing a set of 30 questions and answers, the authors address various issues related to climate: the climate system, natural factors impacting climate, how mankind has an influence on climate, how the climate system reacts to disturbances, what we know about climate history, how we observe climate today, what is a climate model, what we learn from past climate variations, what are the noticed changes since 1900, whether recent changes are normal or not, which are the factors responsible of current changes, what is the effect of human activities on carbon cycle, whether climate change affects water cycle, which are the best indicators of global warming, if climate change has already measurable effects, whether extreme events are a consequence of climate change, the difference between climatic and meteorological forecasts, how to foresee future evolutions of climate, the consequences of a 2 or 5 degree temperature rise, if the Arctic will be the new Eldorado, the confidence in climate models, uncertainties for the future, manoeuvre margins, the use of climate predictions as aids to decision, whether climate change is irreversible, why we must act now, whether climate can be manipulated, whether climate policies are efficient, and which will be climate sciences for tomorrow?