Crutzen, P. J. Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;
de Fries, R. S., Ellis, E. C., Chapin III, F. S., Matson, P. A., Turner II, B. L., Agrawal, A., et al. (2012). Planetary Opportunities: A Social Contract for Global Change Science to Contribute to a Sustainable Future. Bioscience, 62(6), 603-606.