@article {Rockstrom2009Safe,
	title = {A safe operating space for humanity},
	journal = {Nature},
	volume = {461},
	number = {7263},
	year = {2009},
	month = {September},
	pages = {472{\textendash}475},
	publisher = {Nature Publishing Group},
	abstract = {Identifying and quantifying planetary boundaries that must not be transgressed could help prevent human activities from causing unacceptable environmental change, argue Johan Rockstr{\"o}m and colleagues.},
	keywords = {biodiversity, conservation, course, ecology, tippingpoints},
	issn = {0028-0836},
	doi = {10.1038/461472a},
	url = {http://dx.doi.org/10.1038/461472a},
	author = {Rockstrom, Johan and Steffen, Will and Noone, Kevin and Persson, Asa and Chapin, F. Stuart and Lambin, Eric F. and Lenton, Timothy M. and Scheffer, Marten and Folke, Carl and Schellnhuber, Hans J. and Nykvist, Bjorn and de Wit, Cynthia A. and Hughes, Terry and van der Leeuw, Sander and Rodhe, Henning and Sorlin, Sverker and Snyder, Peter K. and Costanza, Robert and Svedin, Uno and Falkenmark, Malin and Karlberg, Louise and Corell, Robert W. and Fabry, Victoria J. and Hansen, James and Walker, Brian and Liverman, Diana and Richardson, Katherine and Crutzen, Paul and Foley, Jonathan A.}
}
@article {Walther2002Ecological,
	title = {Ecological responses to recent climate change},
	journal = {Nature},
	volume = {416},
	number = {6879},
	year = {2002},
	month = {March},
	pages = {389{\textendash}395},
	publisher = {Nature Publishing Group},
	abstract = {There is now ample evidence of the ecological impacts of recent climate change, from polar terrestrial to tropical marine environments. The responses of both flora and fauna span an array of ecosystems and organizational hierarchies, from the species to the community levels. Despite continued uncertainty as to community and ecosystem trajectories under global change, our review exposes a coherent pattern of ecological change across systems. Although we are only at an early stage in the projected trends of global warming, ecological responses to recent climate change are already clearly visible.},
	keywords = {climate, climatechange, discussion, ecology},
	issn = {0028-0836},
	doi = {10.1038/416389a},
	url = {http://dx.doi.org/10.1038/416389a},
	author = {Walther, Gian-Reto and Post, Eric and Convey, Peter and Menzel, Annette and Parmesan, Camille and Beebee, Trevor J. C. and Fromentin, Jean-Marc and Hoegh-Guldberg, Ove and Bairlein, Franz}
}
