By promoting optimistic and appealing future scenarios, we may be able to inspire young people to become technologists and scientists that work to create such a future. (More on the Optimistic SciFi movement at Neal Stephenson's Project Hieroglyph page http://hieroglyph.asu.edu/)
Below is my humble submission:
Small scale fusion and distributed solar cells make energy cheap enough to ignore.
Radical transparency reduces inequality to tolerable background levels. Prediction markets and algorithms inform policy making.
New perennial food crops, restore tilth and sequester carbon in healthy, biodiverse soils. Small scale attempts at deextinction lead to increasingly ambitious rewilding projects.
Human population voluntarily split between dense cities and distributed villages. All are connected by high speed networks. There are no hinterlands.
Automation renders most human work unnecessary, liberating people to engage in creative and analytic pursuits. Code and algorithm auditing are major sources of employment.