The relevance of the outbreak of the First and Second World Wars to the posthumous reception of Ratzel's work cannot be overestimated; Kjellen in particular was one of the main protagonists of Ratzel's revival. Kjellen and Schmitt appropriated and transformed Ratzel's concepts for their research aims, in order to highlight a new turning point in the political and juridical sciences and in politics. As a consequence, their Ratzel was oriented toward militant aims.

This paper assesses peoples' knowledge and perceptions of the invasive palm (Trachycarpus fortunei) in Ticino, Switzerland. Such information is important for guiding decision-making and management planning. In general, although the palm induces positive perceptions in most respondents, the majority of people realise the threat that invasions pose to the region. Therefore, most respondents supported the regulations and management for this popular ornamental plant.

This study uses geographic information systems (GIS) to determine which landforms are most visible to motorists from the highways of the northwestern US. Using an elevation dataset, a computer determined the area visible from sample points taken at 1 km intervals along the highway network. Highly visible mountains, ridges, and valleys were identified and mapped. These methods can be used to identify scenic byways, inform infrastructure development, and improve maps and navigation apps.

La riduzione del rischio, nelle aree poste in prossimità di pareti rocciose, mediante gestione dei sistemi di monitoraggio con finalità d'allerta evidenzia potenzialità, ma anche numerose criticità e limiti. L'articolo prende in esame due frane, originatesi da pareti rocciose, avvenute in prossimità di aree abitate nelle Alpi. Si analizzano costi ed efficacia sia delle opere di difesa sia dei sistemi di monitoraggio con funzione di early warning anche in relazione a soglie d'allerta e scenari.