Datavisualization
Environmental issues are interdisciplinary and wickedly complex. Fortunately, following the lead of Doug Engelbart and Buckminster Fuller see (animated intro), we have better tools for seeing order and solutions.
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General
Eric Berlow (TEDtalk video).
Simon Shum at Open University in the UK creates amazing tools.
Graphiz gallery. Open source software.
Specific
How Much is Left (resources) infographic.
Money (no kidding!) including breakdowns such as of electricity.
Our Energy Dilemma in Three easy Charts
Population
Care2 gives various kinds of eco and demographic info based on geography.
If the world's population lived in one city (different densities).