Lots of recent work has demonstrated the importance of forests in cloud formation. This isn't just as a consequence of evapotranspiration (which adds water vapour into the atmosphere), but also due to the chemicals the forest canopy releases, known as volatile organic compounds (VOCs).

Using the results of experiments conducted at CERN, this new research highlights the role that these VOCs play on cloud nucleation (cloud seeding). It is another example of how forests not only respond to climate, but play a fundamental role in regulating it...