How do you destroy the world in eighty days?

Answer 1

The way you can destroy the world with nukes is to combine 17 trillion times the world's nuclear power, send them off to the moon, and speed them up to 1500 MPS while orbiting, then set a course for Earth. In other words, impossible.

To destroy the Earth, like really destroy it, you need a an object twice the size of mars, made of iron, to crash into the earth. This would effectivey shatter the crust, shoot the mantle out into space, and make the core a new, miniture planetoid without an atmosphere.
Planting 30 nukes in every country around the world. BOOOOM!!

Answer 2

Uninhabitable:

Nuclear bombs

Fires

Floods

Too much C02

Too much humidity

Too much etc

Scorching the suface

Total destruction;

Superlaser collider or superlaser (Star Wars)

Red matter (Star Trek)

volley of fusion bombs to planet core

Seismic reactions

Propell it into the Sun (Invader Zim)

Answer 3

There are said to be enough nuclear weapons to destroy the earth several times over, but this would just mean that the world population could be wiped out. Even then there is no guarantee you could kill everyone on the planet within 80 days. Planet earth would still also be intact. It would take a pretty big force to completely destroy the earth in a Star Wars Deathstar fashion, technology that we don't have at the moment.