Is the rainforest a sink or a source of CO2?

(Image: Pixabay CC0) Clouds talk to leaves and the leaves talk back. Scientists from Wageningen and Utrecht spent three weeks in the Amazon listening to that conversation. The image of a dialogue comes from professor of Meteorology and Air Quality Jordi Vilà. He uses it in one of the blogs written during the expedition to the Brazilian rainforest. Trees don't talk, of course, but the image gets the point across. Speech is communication; in this case the interaction of leaves and passing clouds through the play of light. The project Vilà and his team have been working on for some time is called CloudRoots.