"...start work on the space elevator..."
Space Elevator fanboyz make me laugh.
They're okay with all the prerequisites...
Magic 40,000 km long cable made from carbon nanotubes something_or_other
Whirling counterweight securely tugging on said cable
Vague hopes about weather, induced currents, wayward aircraft
Some magic power-beaming laser beam or microwave thingy to power the climber
But when I suggest using a looped cable, a simple pulley at the top and a simple electric drive motor on the ground, suddenly they get all immediately-practical on me, and the pulley concept becomes a compete impossibility.