Why is the Guardian publishing this "stolen", confidential document?

Confidential document reveals Obama's hardline US climate talk strategy | Environment | guardian.co.uk

A document accidentally left on a European hotel computer and passed to the Guardian reveals the US government's increasingly controversial strategy in the global UN climate talks.
...This is the clearest signal that the US will refuse to negotiate on separate elements of the controversial accord, but intends to push it through the UN process as a single "take it or leave it" text.
...

[From the document] Continue to conduct interviews with print, TV and radio outlets driving the climate change story.

• Increase use of off-the-record conversations.
...
• Prior to the 9-11 April meeting in Bonn it would be good for Todd to meet with leading NGOs. This should come in the form of 1:1s and small group sessions. [If they took place, why weren't these meetings on C-SPAN?]

• Larger group sessions, similar to the one held at CAP prior to Copenhagen, will be useful down the line, but more intimate meetings in the spring are essential to building the foundation of support. Or at the very least, disarming some of the harsher critics.