Latest Aradhna Tripati Stories

By Kim DeRose, UCLABy studying fossilized mollusks from some 3.5 million years ago, UCLA geoscientists and colleagues have been able to construct an ancient climate record that holds clues about the long-term effects of Earth's current levels of atmospheric carbon dioxide, a key contributor to global climate change.Two novel geochemical techniques used to determine the temperature at which the mollusk shells were formed suggest that summertime Arctic temperatures during the early Pliocene...

Scientists say that a new historical record of carbon dioxide levels is showing that current political targets on climate may be "playing with fire."The researchers used ocean sediments to map CO2 levels dating back to 20 million years ago. Levels similar to those now commonly regarded as adequate to tackle climate change were linked to sea levels 80-130 ft higher than today. The researchers noted in the journal Science that this extends knowledge of the link between CO2 and climate...

You would have to go back at least 15 million years to find carbon dioxide levels on Earth as high as they are today, a UCLA scientist and colleagues reported Oct. 8 in the online edition of the journal Science."The last time carbon dioxide levels were apparently as high as they are today "” and were sustained at those levels "” global temperatures were 5 to 10 degrees Fahrenheit higher than they are today, the sea level was approximately 75 to 120 feet higher than today, there was...