Volume 12 Issue 7, July 2022

Ecosystem services are often omitted from climate policy owing to difficulties in estimating the economic value of climate-driven ecosystem changes. However, recent advances in data and methods can help us overcome these challenges and move towards a more comprehensive accounting of climate impacts.

Incorporating the carbon services of wild animals into financial markets has the potential to benefit both climate and conservation through the development of carbon offsets that are equitable and nature positive. However, for this paradigm to be successful, many challenges regarding science, finance and law still need to be overcome.

The expansion of urban environments contributes to climate change and biodiversity loss. Implementing nature-based strategies to create ‘regenerative living cities’ will be critical for climate change mitigation and adaptation and will produce measurable biodiversity and wellbeing co-benefits.

Climate model projections of the terrestrial water cycle are often described using simple empirical models (‘indices’) that can mislead. Instead, we should seek to understand climate model projections using simple physical models.

As deaths attributable to climate change increase, there has been a call from some scientists for the inclusion of climate-related data on death certificates. However, others argue that there are more important methods to reduce the impacts of climate extremes on people.

Summits on climate change, organized by various (international) institutions on a frequent basis, seek to discuss and decide on future initiatives for climate action. Research now shows that there is significant variation in their effectiveness in terms of climate mitigation.

The world’s poorest households, who often depend on agricultural incomes, are increasingly vulnerable to weather-induced shocks. A recent study shows how anti-poverty programmes can help to protect both consumption and income when exposed to shocks.

A warmer world will shift mortality patterns around the world. Research suggests that the mortality costs from climate change will be massively larger than previously thought, despite accounting for future adaptation and rising incomes.

Quantifying historical trends in tropical cyclone activity has proved difficult, but a new reconstruction reveals a clear global decline over the past century, driven by an increasingly cyclone-hostile environment in the troposphere.

Years of research on adaptation to climate change shows that many efforts are counterproductively increasing vulnerability, rather than reducing it — known as ‘maladaptation’. Now a study suggests ways forward by identifying four structural challenges that need to be overcome in adaptation implementation.

Falling raindrops have an essential but as yet unquantified role in planetary climate change. An approach to quantifying precipitation efficiency establishes that the way raindrops reach the surface plays an important part in persistent uncertainties over future tropical atmospheric circulation and extreme precipitation.

A projected change in the El Niño–Southern Oscillation (ENSO) is found to induce a change in high-latitude winds, thereby affecting future Southern Ocean warming. A greater projected increase in ENSO amplitude in response to transient greenhouse forcing weakens high-latitude westerly poleward intensification and slows future Southern Ocean warming.

We tracked the annual extent of rivers on the Greenland ice sheet, revealing that the ice sheet's runoff area expanded by 29% between 1985 and 2020. Strong melting and refreezing has transformed the upper snow and firn layers into thick ice, enabling runoff from higher elevations even during cooler summers.

Climate change affects sea surface density via changes in the sea surface temperature and salinity. These projected sea surface density changes are likely to affect the dispersal patterns of widely distributed mangrove species and are expected to be largest in the Indo West Pacific, the primary hotspot of mangrove diversity.

Joint initiatives by state and non-state actors launched at climate summits are expected to enhance climate governance. However, those launched at earlier summits often perform better, as do initiatives in areas such as transport, energy and industry and ones with robust institutional arrangements.

Climate change may increase or decrease human migration. Applying an integrated assessment model with migration dynamics to income data, the authors show that the lowest-income groups have mobility reduced by 10–35%.

Falling raindrops play an essential but as-yet unquantified role in planetary climate change. Here the authors use the concept of precipitation efficiency to establish that raindrops play a critical role in predicting future tropical atmospheric circulation and extreme precipitation.

The ocean absorbs atmospheric heat; understanding this process is needed to predict climate change impacts. Model analysis shows the influence of the El Niño–Southern Oscillation (ENSO) on Southern Ocean heat uptake—projections with larger (smaller) ENSO amplitude show less (more) ocean warming.

Detecting change in tropical cyclones is difficult from observational records. Here a reconstruction using reanalysis data of annual cyclone numbers shows they have declined globally and regionally over the twentieth century.

Changes in wave climate can pose substantial risk to coastal areas. Here transitional wave climate regions—areas where a wave climate will increase its frequency of occurrence—are identified and classified with implications for understanding future coastal risk.

Ice that melts at high elevation often refreezes and, therefore, does not contribute to the shrinking of ice sheets. Here, the authors show that the elevation at which melting ice starts to contribute to runoff has increased over recent years in Greenland, expanding the runoff area by 29%.

Climate change is expected to impact moisture supply, which is critical for production of food and carbon uptake by terrestrial ecosystems. A shift from ecosystem energy to water limitation is predicted between 1980 and 2100, with implications for ecosystem function under climate change.

The authors project the impacts of future changes in sea surface temperature, salinity and therefore density on the dispersal of buoyant mangrove propagules. They show that warmer and fresher oceans may increase propagule sinking rates, potentially reducing future mangrove resilience.