There are more than 9,000 types of trees we don't know of yet, study finds

A new tropical tree species discovered in Cameroon was recently named after actor and climate advocate Leonardo Di Caprio, who had campaigned against rampant deforestation in the African nation. A new study suggests the world may need to come up with a long list of other climate champions soon, with researchers estimating there are still 9,000 types of trees yet to be discovered, let alone named.