LED lighting
advanced materials
air pollution in national parks (Yosemite, Zion)
allocation of radio frequencies
automated highways
automobile exhaust technology
automobile safety / crashworthiness of automobiles
biomass (including South America)
clean turbo diesel engines
colonization of mars
concrete houses
detonation of explosives
dioxin
disposal of radioactive waste
earth-sheltered homes
effects of nuclear war
el nino / la nina
electricity or gas deregulation
flywheels
forecasting earthquake
forecasting tornados
forecasting volcanos / Mt St. Helens
geothermal home heating & cooling
high speed trains
Chernobyl now
maglev trains
magnetic fusion power
nuclear terrorism
ocean pollution
ocean thermal energy conversion
oil spills
overfishing / seafood depletion
overgrazing
rainforests & deforestation
rare earth metals: resources & consumption
reprocessing of radioactive wastes
satellite communication
satellite reconaissance for ecology measurements
spread of HIV in Africa
terraforming
topsoil
urban planning / "smart growth"
using ice cores to measure historical climate