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The international climate science community is undertaking an extensive programme of numerical simulations of past and future climates. Its conclusions will contribute significantly to part one of the IPCC1 Sixth Assessment Report, which is expected to be published in 2021. The French scientists involved in the work, in particular at the CNRS, the CEA and Météo-France, were the first to submit their contributions, and they have now revealed the broad outlines of their findings. Specifically, their new models predict that warming by 2100 will be more severe than forecast in earlier versions. They are also making progress in describing climate at the regional level.

After the heat wave of the last week of June 2019, a second record-breaking heat wave struck Western Europe and Scandinavia at the end of July 2019. Temperature records were broken again. This study assesses how human-induced climate change has altered the likelihood and intensity of the July event or similar events.

French climate scientists announce today the release of new datasets that promise to provide fresh insights into past and future climate change. They are indeed engaged in an international effort to provide a new generation of climate change experiments.

Submesoscale currents, which are difficult to observe and model, nevertheless have an important role to play in organizing marine life. By extrapolating the results of a large number of local studies published over the past twenty years, French and American researchers have shown that these currents play an essential role for the biodiversity.

A new study analyzes national greenhouse gas emission reduction targets for the 2025-2030 horizon as measured by Nationally Determined Contributions (NDC). It estimates that NDCs project global emissions in the range of 56.8 to 66.5 GtCO2eq / yr, which is higher than previous estimates. The range of uncertainty is wider than most of those published so far, which is mainly explained by the fact that a set of GDP scenarios are envisaged rather than a single scenario for the countries that have expressed their goal as a reduction in the carbon intensity of their economy.

The surface of the planet Mars tilted by 20 to 25 degrees, 3 to 3.5 billion years ago. And the cause was a vast volcanic structure, the largest in the solar system. Because of its extraordinary mass, the Tharsis volcanic dome caused a rotation of the crust and mantle of Mars with respect to its core. The far-reaching implications of this great tilt exposed in the article profoundly strengthens the links between internal dynamics, magnetic field, volcanic activity, tectonism and climate evolution. A new face for the planet Mars during the first billion years of its history, at a time when life could have appeared, stems from this study.

The CFCC15 Conference's Scientific Committee *, chaired by Chris Field, the Chairs of the Organising and High-Level Committees, Hervé Le Treut and Jean Jouzel, and the International organisers (UNESCO, Future Earth, and ICSU) issued an outcome statement : "Science offers robust foundations for ambitious outcomes at COP21 and beyond"

The equatorial regions of Titan (the largest moon of Saturn) are covered by a large field of linear dunes propagating eastward. This direction is opposite to mean winds predicted by climatic models, constituting one of Titan's great mysteries. By combining results from a regional model applied to methane clouds with a Titan global climate model , a French-American team showed that the formation of Titan's dunes should be controlled by rare tropical methane storms producing strong eastward gusts dominating the sand transport. These results explain the shape, orientation and direction of propagation of Titan's dunes, and provide clues on the origin of Titan's sand.

The development of wind farms in Europe only has an extremely limited impact on the climate at the continental scale, and this will remain true until at least 2020. These results were established using climate simulations that included the effect on the atmosphere of wind farms located in Europe, on the basis of a realistic scenario forecasting a two-fold increase in wind energy production by 2020, in accordance with European countries' commitments. The work highlights the importance of carrying out fresh studies to assess the impact of wind energy development by 2050.

During its path above Ile de la Réunion on January 2, 2014, the SAPHIR instrument, embarked on Megha-Tropiques satellite, captured 21 brightness temperature images showing the evolution of the storm structure from its early stage as a tropical depression, to the full cyclone, and then to the dissipating stage.