Sometimes we ask what is happening to the weather. So we go to the experts, who tells us, in language appropriate to the subject, what happened yesterday, what is happening today, and what might happen in the next few years. Weather and climate specialists all over the world have amassed a vast quantity of information. They can describe what is happening around us. With satellites they can forecast more accurately what might happen in the immediate future. Their research has produced evidence of why past climatic changes took place.