In recent years, experiments (Fleming group in Berkeley) showed that excitonic energy transfer in photosynthesis is quantum coherent for several hundreds of femto-seconds and thus for a big part of the total transfer time. I show how coherence can survive despite strongly coupled environmental fluctuations, namely due to two features of the fluctuation spectra: spatial correlations and/or suppression of fast fluctuations. These findings raise many questions regarding the use of quantum coherence by nature in living things.