Our mission: to understand a changing Earth and its relationships with humankind and to develop strategies for a sustainable future. An overarching theme in Earth & Environment is climate science: the defining and unifying earth and environmental science issue of the 21st century. The coupled natural and human dimensions of climate change infuse our research, whether in the form of climate reconstructions; regional climate variability; the impacts of climate change on nutrient cycling, plant communities, and ecosystems; the consequences of climate-change mitigation and adaptation for energy markets; or climate change risks on agriculture and the implications for regional food security, among many other active areas of research.