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From my experience, Earth and Environmental Scientists have needs for referencing data based on place, time, and taxa (species). Many have needs to work with geographic information systems. Some need to work with chemical structure data, which can be complex. There are particular needs to find other data relevant to a particular area on the earth at a particular time or about a particular range of species. Working with remote sensing satellite data can be a challenge for new users, as the file formats can be complex and the data volumes are large. Collecting metadata while out in the field (sometimes with tough weather conditions and/or poor network connectivity) can be a challenge. At the same time, the geolocation features of modern electronics and more pervasive cellular connections can greatly simplify the collection of good metadata. Earth and Environmental Sciences data can be extremely complex in terms of structure, though that's hardly unique to this range of disciplines. Preservation can be a particularly strong need, because a measurement about a particular place and time on Earth cannot be repeated, unlike some laboratory sciences.