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  • High-tide flooding (HTF) is more likely with sea-level rise. Projections along the United States coastline, considering likely sea-level rise and tidal amplitude cycles, suggest increased HTF event clustering in time and rapid increases in annual HTF frequency as early as the mid-2030s.

    • Philip R. Thompson
    • Matthew J. Widlansky
    • William Sweet
  • It is commonly assumed that the climate response to CO2 removals is equal in magnitude and opposite in sign to the response to CO2 emissions. The response, however, is asymmetric, meaning that offsetting CO2 emissions with equal removals could lead to a different climate than avoiding the emissions.

    • Kirsten Zickfeld
    • Deven Azevedo
    • H. Damon Matthews
  • Tropical rainfall exhibits cyclic north–south migration tracking the warmer hemisphere, and climate warming will delay this seasonally over land. Climate models and gridded precipitation data suggest a delay of about 4 days since 1979 is now detectable over Northern Hemisphere land and the Sahel.

    • Fengfei Song
    • L. Ruby Leung
    • Yun Qian
  • Global humidity increases with warming, but the United States Southwest has shown summer decreases since 1950, with the largest declines on hot days attributed to decreased soil moisture, not atmospheric moisture transport. Projections are uncertain due to model spread in precipitation trends.

    • Karen A. McKinnon
    • Andrew Poppick
    • Isla R. Simpson
  • Uncertainty in estimates of the economic impacts of climate change makes it difficult to evaluate the benefits of mitigation. This Perspective reviews methods for determining economic damages from biophysical impacts, highlights critical gaps and suggests priorities moving forward.

    • Franziska Piontek
    • Laurent Drouet
    • Massimo Tavoni
  • The authors assess the productivity of conservation agriculture systems for eight major crops under current and future climate using a global-scale probabilistic machine-learning approach, revealing substantial differences in yield gain probabilities across crop type, management practice, climate zone and geography.

    • Yang Su
    • Benoit Gabrielle
    • David Makowski
  • Increasing Republicans’ belief in climate change is challenging yet needed for broader support of policy. Targeted advertisements featuring Republican voices may be a solution to increase their understanding of climate change.

    • Phillip Ehret
    News & Views
  • Climate change communication is more likely to persuade when the message and the messenger resonate with the audience’s values and identities. A campaign field experiment testing online messages tailored to US Republicans increased their climate change beliefs, risk perceptions and issue importance.

    • Matthew H. Goldberg
    • Abel Gustafson
    • Anthony Leiserowitz
  • The role of peatlands in future climate change is uncertain because peat-derived greenhouse gas emissions are difficult to predict. Now research shows that reduced methane emissions from drying peatlands are likely to be outweighed by increasing CO2 emissions.

    • Paul J. Morris
    News & Views
  • The climate impact of water-table drawdown in peatlands is unclear as carbon dioxide emissions increase and methane emissions decrease due to drying. This study shows decreasing water-table depth results in net greenhouse gas emissions from global peatlands, despite reducing methane emissions.

    • Yuanyuan Huang
    • Phillipe Ciais
    • Laiye Qu
  • Lakes are warming globally at variable rates with important consequences for species survival. Now, research quantifies change in thermal habitat of lakes around the world and shows that season or depth restrictions on species responses may increase thermal habitat change threefold.

    • Gretchen J. A. Hansen
    News & Views
  • COP26 will mark six years since the Paris Agreement was reached, with the ambitious 1.5 °C warming target. After the turbulent year of 2020, now is the time that countries need to commit to drive global climate action forward.

  • Recent changes to how clouds are represented in global models, especially over the Southern Ocean, resulted in increased climate warming. Correcting rain processes in a model shows improved cloud representation but leads to a greatly enhanced negative feedback, offsetting documented increases in model climate sensitivity.

    • Graeme L. Stephens
    News & Views
  • Exploring how biodiversity and climate change are interlinked, the authors show that limiting warming could maintain tree diversity, avoiding primary productivity loss. Countries with greater climate change economic costs benefit most: a potential triple win for climate, biodiversity and society.

    • Akira S. Mori
    • Laura E. Dee
    • Forest Isbell