The first is the Google Earth Engine.
Posted about this before, but a reminder of the environmental elements which can be accessed from the site.
Google Earth Engine brings together the world's satellite imagery — trillions of scientific measurements dating back almost 40 years — and makes it available online with tools for scientists, independent researchers, and nations to mine this massive warehouse of data to detect changes, map trends and quantify differences on the Earth's surface. Applications include: detecting deforestation, classifying land cover, estimating forest biomass and carbon, and mapping the world’s roadless areas.
Also check out the GeoData portal from Tufts University in the USA.
Plenty of layers which can be accessed using the search function, and then adding them to the cart (which enables a download of the data - often in shapefile format)
The shapefiles could presumably then be opened in ArcGIS Online.
There is a user guide which can be accessed by clicking the tab top right....
Thanks to Keir Clarke for the link to the site....
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