A recent opinion piece rekindled debate as to whether geography's current interdisciplinary make-up is a historical relic or an actual and potential source of intellectual vitality. Taking the latter position, we argue here for the benefits of sustained integration of physical and critical human geography. For reasons both political and pragmatic, we term this area of intermingled research and practice critical physical geography (CPG). CPG combines critical attention to power relations with deep knowledge of biophysical science or technology in the service of social and environmental transformation. We argue that whether practiced by individuals or teams, CPG research can improve the intellectual quality and expand the political relevance of both physical and critical human geography because it is increasingly impractical to separate analysis of natural and social systems: socio-biophysical landscapes are as much the product of unequal power relations, histories of colonialism, and racial and gender disparities as they are of hydrology, ecology, and climate change. Here, we review existing CPG work; discuss the primary benefits of critically engaged integrative research, teaching, and practice; and offer our collective thoughts on how to make CPG work.Keywords: physical geography, critical human geography, transdisciplinarity, anthropoceneIntervention en géographie physique critique Un article d'opinion paru récemment est à l'origine de la relance d'un débat qui pose la question à savoir si le fondement interdisciplinaire actuel de la géographie serait une relique historique ou une source réelle et potentielle de vitalité intellectuelle. En prenant la défense de la seconde position, nous militons en faveur des bénéfices découlant de l'intégration soutenue de la géographie physique et de la géographie humaine critique. Pour des raisons à la fois politiques et pragmatiques, nous avons nommé ce domaine de recherche et de pratique enchevêtré la géographie physique critique (GPC). C'est au service de la transformation sociale et environnementale que la GPC intègre un regard critique sur les relations de pouvoir à la connaissance profonde de la science ou de la technologie biophysique. Que se soient des individus ou des équipes qui la pratiquent, les travaux de recherche en GPC peuvent contribuer à l'amélioration de la qualité intellectuelle et à l'élargissement de la pertinence politique de la géographie humaine critique et géographie physique, compte tenu que la séparation de l'analyse des systèmes naturels et des systèmes sociaux pose des difficultés d'ordre pratique. À l'origine des paysages sociobiophysiques se trouvent autant les relations inégales de pouvoir, les histoires de colonialisme et les disparités raciales et entre les sexes que l'hydrologie, l'écologie et les changements climatiques. Dans cette partie de l'article, nous passons en revue les travaux actuels en GPC, nous engageons une discussion sur les principaux avantages des approches intégratives et véritablement critiques en recherche, dans l'ense...

Tree-ring records provide global high-resolution information on tree-species responses to global change, forest carbon and water dynamics, and past climate variability and extremes. The underlying assumption is a stationary (time-stable), quasilinear relationship between tree growth and environment, which however conflicts with basic ecological and evolutionary theory. Indeed, our global assessment of the relevant tree-ring literature demonstrates non-stationarity in the majority of tested cases, not limited to specific proxies, environmental parameters, regions or species.Non-stationarity likely represents the general nature of the relationship between tree-growth proxies and environment. Studies assuming stationarity however score two times more citations influencing other fields of science and the science-policy interface. To reconcile ecological reality with the application of tree-ring proxies for climate or environmental estimates, we provide a clarification of the stationarity concept, propose a simple confidence framework for the re-evaluation of existing studies and recommend the use of a new statistical tool to detect non-stationarity in tree-ring proxies. Our contribution is meant to stimulate and facilitate discussion in light of our results to help increase confidence in tree-ring-based climate and environmental estimates for science, the public and policymakers. K E Y W O R D Sclimate reconstruction, dendroclimatology, model calibration, non-stationarity, proxy calibration, tree-rings

This paper draws on the Foucauldian notion of biopower to renarrate the development of conservation science in the US as a form of liberal biopolitical rule. With its emphasis on making nature live, conservation marks a shift away from a sovereign form of rule that emphasized subduing and controlling nature; today, nature is ruled not by the sword but by science. Through a discussion of key concepts in conservation biologypopulations in crisis; evolution and its future orientation; extinction as death that is necessary for life; and diversity as purity-we illustrate the truth discourses, underlying logics, and calculative technologies by which distinctions within nonhuman life are made and made meaningful. We argue that conservation is biopolitical not just in that it moves from controlling individuals to statistically managing populations and species, but also in that it extends the racialized logic of abnormality in its core notions of biological diversity and purity. In the logics of conservation and race, life produces diversity, conceived as variety of biological kinds; within that diversity exist kinds that foster ongoing life, which should be maximized, and kinds that are threats, which should be let die in the name of life in general.

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