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A new report from the University of Wash- ington, in Seattle, published in the journal Science on polar ice sheets in Greenland and Antarctica, works to reconcile dif- ferences between sometimes-conflicting research studies. Scientists compiled 20 years of data to determine how much ice is being lost and sea levels have increased as the global climate warms. Past studies have shown a range of ice losses, from zero to catastrophic. When


the data was synthesized and analyzed holistically, it became clear that the ice sheets are losing three times as much ice each year as they did in the 1990s—in the middle of previous estimates. Ice sheets are one of several main drivers of rising sea levels. Other factors,


which account for 80 percent of the increase, include the melting of glaciers on land and the expansion of the sea itself as the atmosphere heats up. The melting of polar sea ice has no direct effect on sea levels because the ice is already in the water. Glaciologist and co-author Ian Joughin told The Christian Science Monitor,


“The melting needs monitoring to further understand the ice sheet processes lead- ing to the change.”


Better Barters Swapping Trash for Fresh Produce


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Mexico City’s innovative monthly Mercado del Trueque (barter market) in Chapultepec Park is a winning trifecta for citizens, local vegetable and plant vendors and the city’s secretariat of the environment. There, residents can exchange cardboard, paper, glass, aluminum, plas- tic bottles, electronic devices and other waste for paper chits that are redeemed at kiosks for vouchers worth points. The traders can then use the vouchers to buy tomatoes, potatoes, lettuce, lemons and other produce from participating farmers from surrounding districts. Mexico produces 40 million tons of garbage annually, but only recycles about 15 percent. With this barter system, farmers have gained a new place to sell their produce and earn extra income, while the materials collected are processed for industrial reuse.


Source: IPSNews.net


Never doubt that a small group of thoughtfully committed citizens can change the world. Indeed,


it’s the only thing that ever has. ~Margaret Mead


10 NA Twin Cities Edition natwincities.com


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