Saving the World
Although I know only some esoteric metaphysics in detail, this doesn’t stop me from having other ideas. Thoughts to be added as they occur.
Elevator Energy Capture:
whereas some trains use regenerative brakes to reclaim kinetic energy, elevators in tall buildings should have similar systems installed to capture gravitational potential energy created by lifting the elevators to the top floors.

Reverse-Distributed Computing:
whereas huge research projects make use of distributed computing, communities [businesses or whatnot] that cannot afford for everyone to have a personal computer ought to have a centralized computer system that everyone can cheaply patch into from their homes [workstations]. Everyone shares the centralized computing power (& internet), but has a personal monitor, keyboard and mouse. Imagine being able to plug a monitor and keyboard into a wall jack and instantly have a usable, internet connected computer. Some integrated system would need to be created, but it would be a one time cost and cheap compared to everyone buying their own desktop. Include USB and the system is off and running.

[update: I think this is a step in the right direction: Question Box: the Internet for remote places, no literacy or keyboards required. Now just tell me why they can't hook a simple monitor up next to the box to display images?]
Video Game Designs:
Video Game #2: Marionette Theater
Video Game #4: Matrix Bullet-time
Building Community Refrigeration:
Instead of having everyone in a building own their own refrigerator (compressor), each apartment would have an ice-box (more or less). The ice-box would have an internal thermostat and when the temperature rises too high, compressed gas would travel through the walls of the building and into the apartment to cool that particular chest. Only one large (and hence more efficient) compressor would need to be used and the heat that would normally be generated by the individual compressor in the refrigerator would dissipate over the entire building. By dissipating the heat over the entire building instead of over-heating individual kitchens, the heat-transfer process is made more efficient too. (Effectively central air conditioning for refrigeration).
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