| Climate Change News - ENN |
Climate Change News - ENN
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- Volcanoes Indicted for Europe's Long, Big Chill
For years scientists have debated what could have plunged Europe into the half-millennium-long cold spell that ended only a century ago. Was it the temporarily spotless and therefore faint sun, or did a burst of volcanic eruptions loft debris that shaded out a normal sun? Or were the sun and volcanoes in cahoots? Researchers analyzing plants killed in the Little Ice Age's opening years are now pinning the blame on volcanoes alone.
- NASA Confirms Man's role in Global Warming
A new NASA study confirms the fact that greenhouse gases generated by human activity - not changes in solar activity - are the primary force driving global warming.
The study offers an updated calculation of the Earth's energy imbalance, the difference between the amount of solar energy absorbed by Earth's surface and the amount returned to space as heat. The researchers' calculations show that, despite unusually low solar activity between 2005 and 2010, the planet continued to absorb more energy than it returned to space.
James Hansen, director of NASA's Goddard Institute for Space Studies (GISS) in New York City, led the research. Atmospheric Chemistry and Physics recently published the study.
- Carbon Link to Snowball Earth reassessed
In a study published in the journal Geology, scientists at the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science suggest that the large changes in the carbon isotopic composition of carbonates which occurred prior to the major climatic event more than 500 million years ago, known as 'Snowball Earth,' are unrelated to worldwide glacial events.
"Our study suggests that the geochemical record documented in rocks prior to the Marinoan glaciation or 'Snowball Earth' are unrelated to the glaciation itself," said UM Rosenstiel professor Peter Swart, a co-author of the study. "Instead the changes in the carbon isotopic ratio are related to alteration by freshwater as sea level fell."
- UK tops global league table for sustainable corporations
The UK has topped the annual global league table that measures and ranks the world's largest sustainable corporations. The Global 100 is an extensive data-driven corporate sustainability assessment and inclusion is limited to a select group of the top 100 large-cap companies in the world.
Companies are selected based on their performance against 11 indicators covering environmental performance and corporate citizenship such as leadership diversity, greenhouse gas emissions and payment of corporate taxes. The list includes companies from 22 countries encompassing all sectors of the economy, with collective annual sales in excess of $3.02 trillion, and 5,285,645 million employees. Among the 22 countries, the United Kingdom led the way with 16 Global 100 companies, an increase of five from the year before. Japan followed with 11 (down from 19 in 2011).France and the United States tied for third place with each claiming the headquarters of eight Global 100 companies. Rounding out the top ten scoring countries with at least three Global 100 companies were: Australia (seven), Canada (six), Germany (five) Switzerland (five), Denmark (four), Netherlands (four), Norway (four), Sweden (four), and Brazil (three). Sixty-eight per cent of the 2011 companies remained on the list in 2012.
- Why Biodiversity Loss Deserves as Much Attention as Climate Change
Biodiversity loss is probably a challenge that is often ignored as climate change looms. Currently the world is losing species at a rate that is 100 to 1000 times faster than the natural extinction rate, further, it is currently seeing the sixth mass extinction. The previous mass extinction occured 65 million years ago, and was caused by ecosystem changes, changes in atmospheric chemistry, impacts of asteroids and volcanoes. For the first time in history, the current extinction is caused by the competition for resources between a single species Homo sapiens and all others. A recent conference arranged by the Danish Ministry of Environment in the University of Copenhagen, provided an opportunity to influence the process of organizing a UN Biodiversity Panel. More than 100 scientists and decision makers from the EU countries gathered and came to the conclusion that drastic measures should be taken to decelerate current loss of biodiversity.
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