Editorial
Aggrading Ecosystems Require More Nitrogen ... and Find It: Do the low soil nitrogen contents of various ecosystems constrain the degree to which productivity-enhancing phenomena can be expected to be maintained in the long-term?

Medieval Warm Period Records of the Week
This issue's Medieval Warm Period Records of the Week come from the Mexican Highlands and Peruvian Shelf. To access the entire Medieval Warm Period Project's database, click here.

Subject Index Summary
Droughts (North America: Canada): How much worse have Canadian droughts become in response to the supposedly unprecedented global warming of the 20th century?

Journal Reviews
Climate Change in Alaska: What a Difference a Year Makes!: How 1976 changed the climate of Alaska and led to all sorts of political posturing over the state's significance to the global warming debate.

The Urban Heat Island of San Juan, Puerto Rico: How high can it go?

The Little Medieval Warm Period in Northern Fennoscandia: Perhaps "little" is the wrong appellation to attach to this intriguing climatic interval.

Butterfly Biodiversity in Britain: Has it increased or decreased in response to historical warming?

Woody-Plant Invasions of a California (USA) Grassland: How does the shrub invasion of grasslands impact their productivity and potential for carbon sequestration, especially in regions where nitrogen is a major limiting factor?