UN climate heads call for consensus and urge attempts to rebuild trust | Environment | guardian.co.uk

UN climate chiefs meet in Bali, admitting they face 'existential challenge' after failure of Copenhagen climate change talks

Michael Mann - Unprecedented Attacks on Climate Research | Point of Inquiry

In response to growing public skepticism—and a wave of dramatic attacks on individual researchers—the scientific community is now bucking up to more strongly defend its knowledge. Leading the charge is one of the most frequently attacked researchers of them all—Pennsylvania State University climatologist Michael Mann.

[42-minute podcast] In this interview with host Chris Mooney, Mann pulls no punches.

Dr. Nils-Axel Mörner: sea level facts & conditions

Imagery is powerful even if it is untrue. It lingers in the subconscious mind, where it can affect our ability to think critically and receive whole-systems information. We must be vigilant to prevent this.

In this show, Dr. Nils-Axel Mörner clarifies many misconceptions about rising sea levels and offers a comprehensive understanding of this subject.

Clues from Ancient Glacial and Interglacial Times

Today we are in a very cold period in the long-term history of the Earth, and have been for most of the past several million years. Because the Earth is already quite cold, when we have glacial-interglacial cycles, we see large ice sheets coming and going at both poles – in Antarctica, Greenland, and over large parts of North America and Scandinavia. This waxing and waning of polar ice is driven by small changes in the shape of the Earth’s orbit around the sun (it changes from an ellipse to more circular and back again over about 120,000 years), the tilt of the Earth’s axis (it wobbles a bit over 40,000 years), and the exact seasonal timing of when the Earth is at its closest approach to the sun. All of these “orbital” changes impact how much sunlight reaches the Earth as well as when and where it warms the Earth seasonally. Sometimes, the Earth is in an orbital configuration that produces warm winters and cool summers – a combination that usually allows ice sheets to form and grow. Some 10’s of thousands of years later, the opposite occurs – warm summers and cool winters – which can cause ice sheets to rapidly melt. In today’s cold world, these small changes have big effects as the Polar Regions are cold enough to allow large ice sheets to form and last through the warmer periods. Antarctica has been covered in a large ice sheet for many millions of years because of this overall cooling. It still waxes and wanes along its margins but it is always present in the continent’s interior. But prior to about 2.5 million years ago, there was no permanent ice sheet in the north polar regions – it was simply too warm. Further back in time, the Antarctic ice sheet was much smaller than it is today but it was still dancing to the rhythms set by the Earth’s orbit.