"An ever-expanding footprint of our urban areas is not sustainable," says John Gormley, Ireland's Minister for the Environment, Heritage and Local Government. That department has just released a new set of planning guidelines for sustainable residential development in urban areas.

The US's first suburb, Levittown, is launching a program to encourage energy efficiency upgrades in its homes. Volunteers are going door-to-door to publicize house upgrades that could improve the community's carbon footprint by 20%. But "having a green neighborhood and a green home are two different things" --although greening the houses is a step forward, the suburban form creates much greater impacts by requiring car use.

Alex Steffen of WorldChanging on why developing low-emissions vehicles is nowhere near as important as developing more compact, efficient and livable cities. Focus on new automotive technologies can distract us from the much more effective strategy of building in less-consumptive ways.

This beautiful book is an excellent reference for coming to grips with that slippery but important issue, density. Density can have both positive and negative connotations -- and effects -- depending on its context and execution. The photos in Visualizing Density illustrate this wonderfully, and can help us get a better mental grasp on the variety of ways people can live at a variety of different density levels.

Florida's suburban housing boom was fueled by low gas prices, and now those developments are hard-hit. While it's a little late for elected officials to put the brakes on far-flung projects that resemble ghost towns, local governments must start insisting on more sensible, less energy-consumptive models. These include mixed-use enclaves that combine work and home inside urban service boundaries, along with well-situated local transit grids that wean residents off single-occupant cars.

This touchstone book by James Howard Kunstler (author of The Geography of Nowhere)offers a vivid and uncomfortable vision of a post-oil future. As a result of artificially cheap fossil-fuel energy we have developed global models of industry, commerce, food production, and finance that are now threatened with collapse. Building on his previous work analyzing American suburban (i.e., energy-intensive) lifestyles, Kunstler sketches potential outcomes that may result from our current dysfunctional economic and cultural patterns.

Slides and notes from a presentation at the 2006 Atlantic Planners' Institute Conference on how the assumptions behind planning decisions will have to adapt to the changing reality of energy.

A new report led by Urban Land Institute and Smart Growth America shows that urban development is both a key contributor to climate change and an essential factor in combating it. "The research shows that one of the best ways to reduce vehicle travel is to build places where people can accomplish more with less driving," said Reid Ewing, the report's lead author and a research professor at the University of Maryland.

Ashton Hayes, an affluent, sleepy Cheshire community of just 1,000 people, was unexpectedly transformed last year into a model for grassroots efforts to fight climate change. Aiming to become the first carbon-neutral village in the United Kingdom, Ashton residents have mounted an aggressive campaign that is equal parts competition and collaboration, replacing incandescent bulbs, installing solar panels, planting trees, and boosting their recycling.

In what is arguably the most important environmental bill in California since last year's Global Warming Solutions Act, SB 375 attempts to reduce global warming by addressing land use and transportation through better regional planning.