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Despite their global importance, little is known about the few existing examples of impacts into marine environments and icy targets. They are among the least understood and studied parts of impact crater geology. The icy impacts are also of great importance in understanding the developments of the outer planets and their satellites such as Mars or Europa. Furthermore, the impact mechanisms, crater formation and collapse, melt production and the ejecta distribution are scarcely known for impact on targets other than the "classical" solid silicates of the continental crust. The reaction of...

This review gathers astronomers, geologists, biologists, and chemists around a common question: how did life emerge on Earth? The ultimate goal is to probe an even more demanding question: is life universal? This not-so linear account highlights problems, gaps, and controversies. Discussion covers the formation of the solar system; the building of a habitable planet; prebiotic chemistry, biochemistry, and the emergence of life; the early Earth environment, and much more.

An increasing number of rural and urban-based movements are realizing some political traction in their demands for food sovereignty. Some are pressuring to institutionalize food sovereignty principles and practices through laws, policies, and programs. While the literature on food sovereignty continues to grow in volume and complexity, there are a number of key questions that, in our view, need to be examined more deeply. These relate specifically to the processes and consequences of seeking to institutionalize food sovereignty: What dimensions of food sovereignty are addressed in public...

An increasing number of rural and urban-based movements are realizing some political traction in their demands for food sovereignty. Some are pressuring to institutionalize food sovereignty principles and practices through laws, policies, and programs. While the literature on food sovereignty continues to grow in volume and complexity, there are a number of key questions that, in our view, need to be examined more deeply. These relate specifically to the processes and consequences of seeking to institutionalize food sovereignty: What dimensions of food sovereignty are addressed in public...