Editorial
Threats to Amazonia: Natural and Otherwise: If people do not directly mess with the tropical forest biome, it should do just fine over the coming decades and centuries.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from Permafrost Regions of the Qinghai-Tibet Plateau.

Subject Index Summary
Roman Warm Period (Europe - Central): How did its warmth compare with that of the Current Warm Period?

Journal Reviews
Six Centuries of Drought in the Uinta Mountains of Utah (USA): What do the data reveal about the impact of 20th-century global warming on droughts of this region?

Tropical Atmospheric Temperature Trends: Simulations vs. Measurements: How do the two compare?

Agricultural Crops, the Herbivorous Pests that Feed on Them, and the Bigger Omnivorous Bugs that Eat the Pests: How do they all fare in a CO2-enriched atmosphere?

Progressive Nitrogen Limitation after Eight Years of CO2 Enrichment of Young Aspen and Birch Trees: How strong has it gradually become?

Global Warming and the Vascular Plant Species Richness of Individual Countries: How is the biological "wealth of nations" impacted by rising temperatures?