Jump to stop global warming...

There's a site that wants 600 million people jumping simultaneously to drive the Earth out of its orbit, which would, in theory (their theory) prevent global warming.

I'm absolutely stupified... Could somebody with an actual science degree please explain to me the kinetic energy required to make such a dramatic change in the Earth's orbit, I would sure appreciate it, cause this whole jumping in the name of Earth sounds like a shitload of hippie bull crap to me.