Advantages and disadvantages on steam engine?

Steam engine advantages

Any suitable form of energy can be used to make steam

Not affected much by high altitudes

Water can be re-used

Steam engine disadvantages

Has low efficiency, around 30%

Are expensive to buy and run

Give off a lot of pollution

Take time to start

Dangerous to use because of high pressure of steam

Only 30% of the steam is used

Lots of energy is needed to make the steam