Mag lev

http://www.thefutureschannel.com/dockets/science_technology/maglev_trains/

solar powered cars

http://www.thefutureschannel.com/dockets/algebra/solar_powered_cars/

electricity

http://www.thefutureschannel.com/dockets/science_technology/making_sparks/

recycling computers

http://www.thefutureschannel.com/dockets/hands-on_math/recycling_computers/

water supply

http://www.thefutureschannel.com/dockets/hands-on_math/water_supply/

wind farm

http://www.thefutureschannel.com/dockets/science_technology/wind_farming/

subway

http://www.thefutureschannel.com/dockets/hands-on_math/new_york_city_subway/