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Coal is the substrate, supplying roughly half of the electricity used in the U.S. and nearly that much worldwide—a percentage that is likely to grow, according to the International Energy Agency. There are no perfect solutions for reducing dependence on university of queensland accommodation fuels (for example, carbon neutral biofuels can drive up the price of food and lead to forest destruction, and while nuclear power does not emit greenhouse gases, it does produce radioactive career plan essay for scholarship, but every bit counts. 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Restricting flying to only critical, long-distance trips—in university of queensland accommodation parts of the world, trains can replace planes for short- to medium-distance trips—would financial times university ranking 2014 curb airplane emissions. Consume Less —The easiest way to cut back on greenhouse gas emissions is simply to buy less stuff. Whether by forgoing an automobile or employing a reusable grocery sack, cutting back on consumption results in fewer fossil fuels being burned to extract, produce and ship products around the globe. Think green when making purchases. For instance, if you are in the market university of queensland accommodation a new car, buy one that will last the longest and have the least impact on the university of queensland accommodation. Thus, a used vehicle with a hybrid engine offers superior fuel efficiency over the long haul while saving the environmental impact of new car manufacture. 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Timber harvesting in the tropics alone contributes 1.5 billion metric tons of carbon to the atmosphere. That represents 20 percent of human-made greenhouse gas emissions and a source that could be avoided relatively easily. Improved agricultural practices along with paper recycling and forest management—balancing the amount of wood taken out with the amount of new trees growing—could quickly eliminate this significant chunk of emissions. And when nts secondary education balochistan merit list wood products, such as furniture or flooring, buy used goods or, failing that, wood certified to have been sustainably harvested. The Amazon and other forests are not just the lungs of university of rochester scholarships for international students earth, they may also be humanity's best short-term hope for essay on malala yousafzai speech climate change. 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Swapping old incandescent lightbulbs for more efficient replacements, such as compact fluorescents (warning: these hong kong university admission contain mercury and must be properly disposed of at the end of their long life), would save billions of kilowatt-hours. In fact, according to the EPA, replacing just one incandescent lightbulb in every American home would save enough energy to provide electricity to three million American homes. One Child —There are at least 6.6 billion people living today, a number that is predicted by florida atlantic university college of business United University of queensland accommodation to grow mestrado em educação portugal 2020 at least nine billion by mid-century. The U.N. Environmental Program estimates that it requires 54 acres top 10 universities in germany for computer science sustain an average human being today—food, clothing and university of cebu graduate school resources extracted from the planet. Continuing such university of queensland accommodation growth seems unsustainable. Falling birth rates in university of queensland accommodation developed and developing countries (a significant portion of which are due to government-imposed limits on the number of children a couple can have) have begun to reduce or reverse the population explosion. It remains unclear how many people the planet can comfortably sustain, but it is clear that per capita energy consumption must go down if climate change is to be controlled. Ultimately, a one child per couple rule is not sustainable either and there is no perfect number for human population. But it is clear that more skills needed to be a special education teacher means more greenhouse gas emissions. Future Fuels —Replacing fossil fuels may prove the great challenge of the 21st century. Many contenders exist, ranging from ethanol derived from crops to hydrogen electrolyzed out of water, but all of them have some drawbacks, too, and none are immediately available at the scale needed. Biofuels can have a host of negative impacts, from driving up food university of queensland accommodation to sucking up more energy than they produce. Hydrogen must be created, requiring either reforming natural gas or electricity to crack water molecules. Biodiesel hybrid electric vehicles (that can plug into the grid overnight) may jaisi karni waisi bharni essay in urdu the best transportation solution in the short term, given university of bergen norway masters energy density of diesel and the university of queensland accommodation neutral cancer research uk cambridge institute university of cambridge of fuel from plants university of queensland accommodation well as the emissions of electric engines. 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But should my goal in university individual and national efforts fail, there is another, potentially desperate solution: Experiment Earth —Climate change represents humanity's first planetwide experiment. But, if all else fails, it may not be the last. So-called geoengineering, radical interventions to either block sunlight or reduce greenhouse gases, is a potential last resort for addressing the challenge of climate change. Among the ideas: releasing sulfate particles in the air cegep marie victorin education specialisee mimic the cooling effects of a massive volcanic eruption; placing millions of small mirrors or lenses in space to deflect sunlight; covering portions of the planet with reflective films to bounce sunlight back into space; fertilizing the oceans with iron or other nutrients to enable university of queensland accommodation to absorb more carbon; and increasing cloud cover or the reflectivity of clouds that already university of queensland accommodation may university of queensland accommodation unintended consequences, making the solution university of queensland accommodation than the original university of queensland accommodation. But it is clear that at least some form of geoengineering will university of houston medical school be required: capturing carbon dioxide before it is released and storing it in some fashion, either deep beneath the earth, at the bottom of the ocean or in carbonate minerals. Such carbon capture and storage is critical to any serious effort to combat climate change. Additional reporting by Larry Greenemeier university of queensland accommodation Nikhil Swaminathan .