What's the lyrics' meaning of "A Smart Kid" - by Porcupine Tree

The lyrics are:

Stranded here on planet earth
It's not much, but it could be worse
Everything's free here, there's no crowds

Winter lasted five long years
No sun will come again I fear
Chemical harvest was sown

And I will wait for you
Until the sky is blue
And I will wait for you
What else can I do?

A spaceship from another star
They ask me where all the people are
What can I tell them?

I tell them I'm the only one
There was a war, but I must have won
Please take me with you

Please take me with you
And I will wait for you
Until the sky is blue
And I will wait for you
What else can I do?
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