Delegates in Rio de Janeiro have agreed on a draft document for world leaders to sign at this week's Rio Plus 20 environmental summit.

The draft calls for protecting the health of the globe while working to lift billions out of poverty through conserving natural resources instead of squandering them.

Very few details from the draft have been released. But environmentalists are already complaining that it is too weak and not ambitious enough.

More than 100 world leaders plan to come to Brazil Wednesday for the summit. It comes 20 years after the first Earth summit led to the Kyoto agreement to cut greenhouse gas emissions believed to cause global warming.