economical - economic (a) - economy - economist (n) - economize (v)
solar energy
jetpack
to lift ... off ...
traffic jam / rush hour
Amphibious bus
canal
tunnel bus
self-driving car
spacious (a) - space (n)
fossil fuels
to pollute (v) - pollution - pollutant - polluter (n) - (un)polluted (a)
to produce (v) - production - produce - producer - productivity (n) - (un)productive (a)
A windmill (n)
lose - lost - lost (v) - loss (n) - lost - lossless (a)
environmentally friendly
