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Volume 12 Number 13:  1 April 2009

Editorial
The CO2-Climate Controversy: Scientists on both sides of the debate have a civic duty to explain their positions to the public and their countries' elected officials.

Medieval Warm Period Record of the Week
This issue's Medieval Warm Period Record of the Week comes from the Lower Murray Lake, Ellesmere Island, Nunavut, Canada.

Subject Index Summary
Permafrost (Impact of Thawing on Methane): Will global warming soon reach a "tipping point" that leads to the release of massive amounts of methane to the atmosphere, leading to even more catastrophic increases in temperature?

Journal Reviews
Greenland's Outlet Glaciers: Is their recent accelerated "march to the sea" a harbinger of a huge (as per Al Gore and James Hansen) sea-level rise over the course of the 21st century?

Summer Ice Melt on Eurasian Arctic Ice Caps: How has it varied over the past six decades?

Ocean Acidification and Marine Coccolithophores: As the air's CO2 content has risen in response to global industrialization, so too have the size and calcifying prowess of the oceans' coccolithophores risen right along with it.

Responses of Coral Reef Fish to Changes in Coral Cover: French Polynesia: How dependent are the former upon the latter?

Responses of Coral Reef Fish to Changes in Coral Cover: Australia: Are the responses encouraging or discouraging?