To vow
Make serious promises
Carbon emission
Carbon gases to go into the air
Gas mileage
Number of miles traveled to the number of gallons of gasoline burned
Congestion
When there are too many cars on a road
Inflated
To be full of air or gas
Energy-efficient
Designed to use as little electricity as possible
Insulation
Put special materials into house walls and around windows to stop heat, sound or others.
LED light bulb
New kind of light bulb that uses very little power
Space heater
Machines designed to keep a small area warm
Homebody
People how love being at home
Takes a bite out of
Reduce by a significant amount.
Icing on the cake.
Something that makes a good situation even better
Pour money down the drain
Money wasted or spend money carelessly
