earlier i spoke with robert mclean and professor of geography and environmental studies at the will for lower university in waterloo, canada. i began by asking him to tell us more about the only annual weather phenomenon in white africa is silver honorable to it. or sure, it's so naturally occurring climate phenomena that happens once or twice each decade. uh, it started about 10 or 11 months ago and it will be at being later this year. it's initiated when trade winds over the pacific ocean. we can allowing really warm water off the coast of asia to migrate across the surface of the pacific ocean where it cools on, on the west coast of the americas. when this happens, it starts to have an effect on global temperatures and precipitation patterns. so we've seen record high temperatures globally over the last 10 or 12 months. we're also seeing changes in precipitation patterns, particularly in southern africa and western africa. for example. this is a part of the world in southern africa where there is a distinct rainy season that runs from november until april will this year, what happene