The birthday of Alexander von Humboldt, an important turn-of-the-nineteenth-century rainforest explorer, was on 14 September. Today, the WWF-initiated Rainforest Day is observed on this date.
Rainforests are important for the climate because they are carbon sinks. In addition, they are host to many varieties of flora and fauna that are unparalleled in their biological diversity. They also store large amounts of fresh water. Since 1989, this day has been an annual reminder that rainforests are at risk of destruction.