Biofuels a costly option

Ultan Doherty (Letters, Feb 28) makes the point that if, as a 13-year-old, she/he understands the threat of fossil fuel depletion and global warming, then why can’t adults?

However, Ultan says that hydrogen, solar, electric and biofuel-powered cars are all viable alternatives?

Hydrogen can only be made from fossil fuels, or by hydrolysis using electricity, mainly produced by fossil fuels, but like electric cars, less efficiently than using them directly.