There is a bridge two miles upstream.

So small input upstream, big result downstream.

I saw a boat upstream of the bridge.

Trying to live eco perfectly in today's system is like trying to swim upstream when the current is pushing us all the other way.

And of course, as you go back upstream, the components get smaller and therefore cheaper.

In fact, there's a fence quite upstream of this threshold, beyond which you are in a danger zone.

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