Climate Change Link to CO2

  Nothing ground breaking here but recent research shows a ‘global pattern’ of change that begun 2.7 million years ago. By Ansgar Walk (Own work) [CC BY-SA 2.5 (http://creativecommons.org/licenses/by-sa/2.5)], via Wikimedia CommonsThere seems to be a feedback process which has amplified climate change. Dr Carrie Lear told BBC News that “this study reveals a feedback process that has magnified climate change since the inception of Northern Hemisphere glaciation 2.7 million years ago. It seems the tropical warming caused by high CO2 levels ...

Working out climate change using oxygen isotopes

  We are told that in the past the planet's atmosphere has been colder and warmer than it is today but how do scientists actually know this?   A variety of methods are used but one uses some straight forward (to understand - not necessarily carry out) chemistry. Oxygen has two stable isotopes, 16O and 18O. 16O evaporates faster than 18O so seawater will contain more 18O than 16O due to evaporation. The water will eventually make its way into rivers and back into the ...