World energy needs?

Factual Questions
1

What are the current world energy needs, and what portion of that is for transportation? If all the cars in the world ran on H2, how much energy would be required to produce that hydrogen if it were all created by cracking water? How is energy consumption predicted to change over the next 100 years? What is the tolerance on those predictions?

I was reading that if all cars ran on H2 and if that was produced by cracking water, it would take 1000 nuclear reactors or 1,000,000 wind turbines to produce the energy needed by 2050 assuming a population of 9 billion. Is that about right?

Thanks for your help,
Rob

2

Are you asking about projected world energy needs or actual world energy consumption? Your post appears to be a mix of the two.

3

I want to know about current and future needs.

Thanks,
Rob

4

Also, the projected energy needs didn’t seem to account for transportation energy requirements. If the grid has to supply all the energy to run the world’s cars, how much extra energy will that take?

Thanks for your help,
Rob

5

Do you mean world energy needs (ie the minimum possible usage) or just wants (ie actual current usage)? The needs would be far less than usage.

6

I take it you didn’t bother to check out the links provided?

7

And what, exactly, fo you consider needs anyway?