Renowned planet hunters Geoffrey Marcy and Paul Butler made the dramatic announcement last week that they had seen a dimming in the light coming from HD 209458 and said it was caused by a planet passing in front of the star.
It also suggests the amount of aerosols that humans emit into the atmosphere could impact tree growth, as high levels of aerosols cause "global dimming", an effect that occurs when the levels of light reaching the Earth's surface fall.