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Ten new insights in climate science 2021: a horizon scan
- Maria A. Martin, Olga Alcaraz Sendra, Ana Bastos, Nico Bauer, Christoph Bertram, Thorsten Blenckner, Kathryn Bowen, Paulo M. Brando, Tanya Brodie Rudolph, Milena Büchs, Mercedes Bustamante, Deliang Chen, Helen Cleugh, Purnamita Dasgupta, Fatima Denton, Jonathan F. Donges, Felix Kwabena Donkor, Hongbo Duan, Carlos M. Duarte, Kristie L. Ebi, Clea M. Edwards, Anja Engel, Eleanor Fisher, Sabine Fuss, Juliana Gaertner, Andrew Gettelman, Cécile A.J. Girardin, Nicholas R. Golledge, Jessica F. Green, Michael R. Grose, Masahiro Hashizume, Sophie Hebden, Helmke Hepach, Marina Hirota, Huang-Hsiung Hsu, Satoshi Kojima, Sharachchandra Lele, Sylvia Lorek, Heike K. Lotze, H. Damon Matthews, Darren McCauley, Desta Mebratu, Nadine Mengis, Rachael H. Nolan, Erik Pihl, Stefan Rahmstorf, Aaron Redman, Colleen E. Reid, Johan Rockström, Joeri Rogelj, Marielle Saunois, Lizzie Sayer, Peter Schlosser, Giles B. Sioen, Joachim H. Spangenberg, Detlef Stammer, Thomas N.S. Sterner, Nicola Stevens, Kirsten Thonicke, Hanqin Tian, Ricarda Winkelmann, James Woodcock
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- Journal:
- Global Sustainability / Volume 4 / 2021
- Published online by Cambridge University Press:
- 18 October 2021, e25
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- Article
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Non-technical summary
We summarize some of the past year's most important findings within climate change-related research. New research has improved our understanding about the remaining options to achieve the Paris Agreement goals, through overcoming political barriers to carbon pricing, taking into account non-CO2 factors, a well-designed implementation of demand-side and nature-based solutions, resilience building of ecosystems and the recognition that climate change mitigation costs can be justified by benefits to the health of humans and nature alone. We consider new insights about what to expect if we fail to include a new dimension of fire extremes and the prospect of cascading climate tipping elements.
Technical summaryA synthesis is made of 10 topics within climate research, where there have been significant advances since January 2020. The insights are based on input from an international open call with broad disciplinary scope. Findings include: (1) the options to still keep global warming below 1.5 °C; (2) the impact of non-CO2 factors in global warming; (3) a new dimension of fire extremes forced by climate change; (4) the increasing pressure on interconnected climate tipping elements; (5) the dimensions of climate justice; (6) political challenges impeding the effectiveness of carbon pricing; (7) demand-side solutions as vehicles of climate mitigation; (8) the potentials and caveats of nature-based solutions; (9) how building resilience of marine ecosystems is possible; and (10) that the costs of climate change mitigation policies can be more than justified by the benefits to the health of humans and nature.
Social media summaryHow do we limit global warming to 1.5 °C and why is it crucial? See highlights of latest climate science.
8 - Nitrogen processes in coastal and marine ecosystems
- from Part II - Nitrogen processing in the biosphere
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- By Maren Voss, Leibniz-Institute of Baltic Sea Research Warnemuende, Alex Baker, University of East Anglia, Hermann W. Bange, Leibniz-Institut für Meereswissenschaften, Daniel Conley, Lund University, Sarah Cornell, University of Bristol, Barbara Deutsch, Stockholm University, Anja Engel, Alfred Wegener Institute for Polar and Marine Research, Raja Ganeshram, University of Edinburgh, Josette Garnier, UMR Sisyphe UPMC & CNRS, Ana-Stiina Heiskanen, Finnish Environment Institute, Tim Jickells, University of East Anglia, Christiane Lancelot, Université Libre de Bruxelles, Abigail McQuatters-Gollop, Sir Alister Hardy Foundation for Ocean Science, Jack Middelburg, Utrecht University, Doris Schiedek, National Environmental Research Institute, Caroline P. Slomp, Utrecht University, Daniel P. Conley, Lund University
- Edited by Mark A. Sutton, NERC Centre for Ecology and Hydrology, UK, Clare M. Howard, NERC Centre for Ecology and Hydrology, UK, Jan Willem Erisman, Gilles Billen, Albert Bleeker, Peringe Grennfelt, Hans van Grinsven, Bruna Grizzetti
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- Book:
- The European Nitrogen Assessment
- Published online:
- 16 May 2011
- Print publication:
- 14 April 2011, pp 147-176
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Summary
Executive summary
Nature of the problem
Nitrogen (N) inputs from human activities have led to ecological deteriorations in large parts of the coastal oceans along European coastlines, including harmful algae blooms and anoxia.
Riverine N-loads are the most pronounced nitrogen sources to coasts and estuaries. Other significant sources are nitrogen in atmospheric deposition and fixation.
Approaches
This chapter describes all major N-turnover processes which are important for the understanding of the complexity of marine nitrogen cycling, including information on biodiversity.
Linkages to other major elemental cycles like carbon, oxygen, phosphorus and silica are briefly described in this chapter.
A tentative budget of all major sources and sinks of nitrogen integrated for global coasts is presented, indicating uncertainties where present, especially the N-loss capacity of ocean shelf sediments.
Finally, specific nitrogen problems in the European Regional Seas, including the Baltic Sea, Black Sea, North Sea, and Mediterranean Sea are described.
Key findings/state of knowledge
Today, human activity delivers several times more nitrogen to the coasts compared to the natural background of nitrogen delivery. The source of this is the land drained by the rivers. Therefore, the major European estuaries (e.g. Rhine, Scheldt, Danube and the coastlines receiving the outflow), North Sea, Baltic Sea, and Black Sea as well as some parts of the Mediterranean coastlines are affected by excess nutrient inputs.
Biodiversity is reduced under high nutrient loadings and oxygen deficiency. This process has led to changes in the nutrient recycling in sediments, because mature communities of benthic animals are lacking in disturbed coastal sediments. The recovery of communities may not be possible if high productivity and anoxia persist for longer time periods.