Brief Communications

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  • The adoption of some climate policies can facilitate the subsequent adoption of other policies, which is referred to as policy sequencing. Across sectors and countries, policy sequences often play an important role in the adoption and stringency of carbon pricing.

    • Manuel Linsenmeier
    • Adil Mohommad
    • Gregor Schwerhoff
    Brief Communication
  • The degree to which aerosols influence surface temperatures is not well understood. Here, the authors argue that reducing the uncertainties in the climate response to aerosol forcing is one of the key challenges to reduce overall uncertainties of warming projections.

    • Duncan Watson-Parris
    • Christopher J. Smith
    Brief Communication
  • A reliable and consistent inventory is important for the international community to track and promote the progress of climate finance. A machine learning classifier reveals that the current framework may overestimate the actual number of bilateral climate finance projects.

    • Malte Toetzke
    • Anna Stünzi
    • Florian Egli
    Brief Communication
  • Young people around the world have joined the school climate strikes and shared belief of the unfair climate threat or proper future actions. However, different adolescents still have divergent opinions on the image, effectiveness or motivation of the protest activities.

    • Katharine Lee
    • Saffron O’Neill
    • Julie Barnett
    Brief Communication
  • The current ambition for hydrofluorocarbon emissions reduction by the Kigali Amendment is not sufficient to meet the 1.5 °C Paris Agreement goal. The authors show that a more ambitious Kigali Amendment target could still help in achieving the Paris goal if more countries act early.

    • Pallav Purohit
    • Nathan Borgford-Parnell
    • Lena Höglund-Isaksson
    Brief Communication
  • Southwestern North America has been experiencing lower than average precipitation and higher temperatures since 2000. This emerging megadrought, spanning 2000–2021, has been the driest 22-year period since the year 800 and 19% of the drought severity in 2021 can be attributed to climate change.

    • A. Park Williams
    • Benjamin I. Cook
    • Jason E. Smerdon
    Brief Communication
  • Evaluation of climate adaptation policies typically compares differences between scenarios with different levels of, or without, climate change. Many policies, however, address development simultaneously, and focusing only on climate change impacts may not identify the best outcome.

    • Bramka Arga Jafino
    • Stephane Hallegatte
    • Julie Rozenberg
    Brief Communication
  • Growth in CO2 emissions has slowed since the Paris Agreement 5 years ago. The COVID-19 pandemic has caused a drop in emissions of about 7% in 2020 relative to 2019, but strong policy is needed to address underlying drivers and to sustain a decline in global emissions beyond the current crisis.

    • Corinne Le Quéré
    • Glen P. Peters
    • Matthew W. Jones
    Brief Communication
  • The societal response to the pandemic has reduced global power demand, disproportionally affecting coal power generation and thus leading to a strong CO2 emissions decline. Policy should apply 2020’s lessons to ensure that power sector emissions have peaked in 2018 and go into structural decline.

    • Christoph Bertram
    • Gunnar Luderer
    • Ottmar Edenhofer
    Brief Communication