"World 'warmest for 12,000 years'"

1. World 'warmest for 12,000 years'
2. Scientists: Earth temperature reaches dangerous level


And a brief retrospective:

i. BBC climate change experiment [also: study finds that Earth is hottest in 400 years]
ii. Three more articles about global warming
iii. This world of ours 1
iv. The heated debate over global warming
v. The heat of 2005