1) electric powered cars

2) muti-fuel engines (some military vehicles have these)

3) water powered vehicles (there was one built by some university students, using hydro-electric engineering)

4) solar powered vehicles (same as above, but roof is replaced by weather resistant solar panels and huge battery bank in trunk with 30 hours of reserve power)

5) used cooking oil from fast food joints work in Diesel engines

6)

Alternative fuel