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By R. Gilles (Eds.)

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They leave crop stubbles or plant a cover crop to protect the soil. They also add compost to the soil and plant hedges as windbreaks. PALM HArVeST Some resources are overharvested for surprising purposes. American and Canadian churches import 30 million palm fronds for Palm Sunday. They come from Mexico and Guatemala, and rain-forest conservation groups say many are taken from wild rain forests. More palm plants are taken than the forest can regrow. 29 average carbon footprint Australians have the highest average carbon footprint, followed by Americans.

Because it’s a liquid, oil is easier to work with than coal. It can be refined into fuels like gasoline and diesel to run cars, trucks, airplanes, and heating systems. It’s also used to make products like plastics, medicines, and detergents. Experts believe there is enough natural gas to last out the century, but beyond that, it’s likely to become very expensive and difficult to extract. hOw muCh is Left? 30 g A Natural gas is actually methane that has collected above oil reserves. It’s the last fossil fuel to be exploited and was first used widely in the 1930s and 1940s.

City fumes t h r e at e n e d a n t a r c t i c a A chemical mix Chemicals people pour into rivers or seas can be swept around the world by ocean currents, eventually washing up at the poles. Or they can be blown away with air pollution and fall onto Antarctica with snow. Scientists have found traces of harmful chemicals in Antarctic penguins, seals, whales, and seabirds. The chemicals include long-banned deadly pesticides such as DDTs. Minimize pollution— and never throw any garbage on the ground, at the beach, in the river, or in the sea!

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