Review Articles

Climate change mitigation strategies based on biochar generation—and its application to agricultural soils—can effectively sequester carbon, although biogeochemical and economic trade-offs must be considered.

A synthesis of intervals of rapid climatic change evident in the geological record reveals some of the Earth system processes and tipping points that could lead to similar events in the future.

Phosphorus plays a dynamic and complex role in marine biogeochemistry, which is closely connected to carbon, nitrogen and metal cycling, according to a literature synthesis on recent advances in understandings of the marine phosphorus cycle.

Highly redox-active compounds play an important role in biogeochemical element cycles in aquatic systems that are exposed to frequent hydrological disturbances.

A review of the organic carbon cycle explores the interactions between the Earth’s surface and deeper reservoirs, the expanding inorganic controls on the organic carbon cycle, and how these links have strengthened through geological time.

Stressors such as large-scale damming, hydrological change, pollution, the introduction of non-native species and sediment mining are challenging the integrity and future of large rivers, according to a synthesis of the literature on the 32 biggest rivers.

Understanding the thermodynamics of air-mass transformations that occur in the atmosphere at the boundary between the Arctic and mid-latitudes is key to improving weather and climate predictions, according to a literature synthesis

Species richness in mountain environments is linked to mountain-building and climatic processes, an integration of geological, climatic, and biological datasets reveals.

The abundance of microorganisms in the continental subsurface may have been overestimated, according to a review compilation of data from subsurface localities around the globe.

Robust evidence for a previously proposed sea-level fall and rise during the Last Interglacial is lacking, according to a synthesis. This calls estimates of high rates of sea-level rise at the end of the Last Interglacial into question.

A review of Earth system changes associated with past warmer climates provides constraints on the environmental changes that could occur under warming of 2 °C or more over pre-industrial temperatures.

Ocean oxygen loss in a warming world is strongly affected by biogeochemical processes that are not fully accounted for in ocean models, suggests a literature synthesis.

The creation of an energetic framework for monsoon systems is needed to fully understand past and future variations in tropical rainfall, according to a literature review.

Indicators of environmental and social footprints of international trade must inform assessments of progress towards the UN Sustainable Development Goals, suggests a synthesis of studies on the geospatial separation of consumption and production.

The Cassini mission revealed the complex workings of Titan’s methane-based hydrologic cycle over a range of timescales, providing a potential window into the future of Earth and its water cycle.

Size, morphology, silica content and life cycle of diatoms affect their contribution to the export of carbon to the deep ocean, suggests a literature review.

Climate sensitivity, the long-term warming due to doubled atmospheric CO₂ levels, is estimated in the range of 1.5 °C to 4.5 °C. A synthesis of work reveals that whether the value falls at the high or low end, future emissions will have to be strongly limited.

Microbial metabolisms depend on enzymes that contain trace metals. A synthesis of molecular and geochemical data shows that these metabolic pathways evolved alongside changing marine availability of trace metals during the Precambrian.

River deltas are shaped by interactions between fluvial and tidal processes. Tides act to stabilize delta morphology, but sediment depletion due to human activities disrupts the balance and leads to erosion and scour.

Extratropical storms contribute to precipitation, wind and temperature extremes. A synthesis of the influences of a changing climate on storm tracks reveals competing effects on meridional temperature gradients, which make projections difficult.