If sustainable aviation fuels take off, which type of fuel will be most widely used?

What percentage of US energy will be produced by each source in 2050?

What power sources will provide at least 10% of the energy used in maritime transportation in 2040.

When will low carbon vehicle sales (e.g. electric, hydrogen, PI hybrid) be more than 90% of all car sales in the USA?

Will I be able to book a commercial electrical flight between London and New York in 2040?

Will the majority of new passenger aircraft sold in 2050 be hydrogen fueled?

Will any electric or hydrogen passenger airplane that can seat at least 100 people be in commercial use before 2033?

Will 0.1% of the US population have traveled in a flying car by 2050?

Will low carbon vehicle sales (e.g. electric, hydrogen, PI hybrid) be more than 50% of all car sales in the USA by 2030?

Will low carbon vehicle sales (e.g. electric, hydrogen, PI hybrid) be more than 80% of all car sales in the USA by 2030?