Related by context. Frequent words. (Click for all words.) 46 conserve 43 metabolism slows 42 NiMH batteries 41 daylight 40 conserving 40 watt incandescent bulb 40 standby mode 40 watt light bulb 39 incandescents 39 conserves 38 incandescent bulb 38 watt bulb 37 fluorescents 37 incandescent lighting 37 incandescent lights 37 terrestrial ecosystems 37 incandescent bulbs 36 Fossil fuels 36 fluorescent bulb 36 watt bulbs 36 programmable thermostat 36 watering lawns 36 fluorescent lamps 36 halogen bulbs 36 rechargeables 36 freshwater 36 waterings 35 drylands 35 energy 35 periods 35 circadian rhythm 35 watt incandescent 35 electricity 35 cold cathode fluorescent 35 wintertime 35 wakeful 35 fluorescent tubes 35 bulbs 35 fossil fuels 35 bulbs CFLs 35 conserved 35 backlight 35 carbon sinks 34 Daylight saving 34 compact fluorescents 34 wetland habitats 34 discretionary 34 infrared wavelengths 34 hibernate 34 gigatonnes 34 habitats 34 Geminids 34 capital expenditures 34 compact fluorescent lights 34 forests 34 compact fluorescent bulb 34 fossil fuel 34 winters 33 sunlight 33 cold winters 33 compact fluorescent bulbs 33 furnace filter 33 #mW [001] 33 watts 33 lumen output 33 femtoseconds 33 kilojoules 33 absorbing carbon dioxide 33 CPU cycles 32 cycles 32 patio heaters 32 bulb 32 seasonably 32 socking away 32 alkaline batteries 32 recharges 32 planet 32 LED bulb 32 nonessentials 32 deciduous trees 32 wildlife habitat 32 interglacial 32 consumes 32 LEDs 32 compact fluorescent 32 seasonally weaker 32 clothes dryers 32 low flow showerheads 32 picosecond 32 light emitting diodes LEDs 32 sunspot cycle 32 incandescent lamps 31 Daylight Savings Time 31 economy 31 ambient light 31 conservation 31 CFL bulbs 31 outdoors 31 fluorescent lights 31 multicellular organisms 31 workweek