Check out the new Sciences Portal in ArcGIS Online at http://science.maps.arcgis.com/home/index.html with some nice introductory material about it already posted by Joseph Kerski
And in support of the Group on Earth Observations (GEO) Week and the GEO-XIV Plenary, 23-27 October 2017 in Washington, DC, Esri offer Insights for a Changing World: The Complete Platform for Earth Observation with an assortment of links to spatially intelligent scientific apps and additional landing pages.