Ice age Keystone Keystone Keystone Keystone Reuters Keystone Keystone Keystone Keystone Reuters Reuters Christian Pfander/EQ Images This content was published on February 4, 2012 - 13:01 February 4, 2012 - 13:01 Share Facebook Twitter E-mail Print Copy link (images: Keystone, Reuters, EQ-images) You can find an overview of ongoing debates with our journalists here. Please join us! If you want to start a conversation about a topic raised in this article or want to report factual errors, email us at firstname.lastname@example.org. Sort by Newest first Oldest first Load more More More Follow us on Telegram You can now also read us on Telegram. Follow this link to subscribe to our channel!