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Answer» <html><body><p><strong>Explanation:</strong></p><p></p><p><strong><u>Forego Fossil Fuels</u></strong>—The <a href="https://interviewquestions.tuteehub.com/tag/first-461760" style="font-weight:bold;" target="_blank" title="Click to know more about FIRST">FIRST</a> challenge is eliminating the burning of coal, oil and, eventually, natural gas. This is perhaps the most daunting challenge as denizens of richer nations literally eat, wear, work, play and even sleep on the products made from such fossilized sunshine. And citizens of developing nations want and arguably deserve the same comforts, which are largely thanks to the energy stored in such fuels.</p><p></p><p><strong><u>Infrastructure Upgrade</u></strong><u>—</u>Buildings <a href="https://interviewquestions.tuteehub.com/tag/worldwide-1461470" style="font-weight:bold;" target="_blank" title="Click to know more about WORLDWIDE">WORLDWIDE</a> contribute around one third of all greenhouse gas emissions (43 percent in the U.S. alone), even though investing in thicker insulation and other cost-effective, temperature-regulating steps can save money in the long run. Electric grids are at capacity or overloaded, but power demands continue to rise. And bad roads can lower the fuel economy of even the most <a href="https://interviewquestions.tuteehub.com/tag/efficient-966565" style="font-weight:bold;" target="_blank" title="Click to know more about EFFICIENT">EFFICIENT</a> vehicle. Investing in new infrastructure, or radically upgrading existing highways and <a href="https://interviewquestions.tuteehub.com/tag/transmission-1426202" style="font-weight:bold;" target="_blank" title="Click to know more about TRANSMISSION">TRANSMISSION</a> lines, would help cut greenhouse gas emissions and drive economic growth in developing countries.</p><p></p><p><strong><u>Stop Cutting Down Trees</u>—</strong>Every year, 33 million acres of forests are cut down. 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 <a href="https://interviewquestions.tuteehub.com/tag/avoided-364725" style="font-weight:bold;" target="_blank" title="Click to know more about AVOIDED">AVOIDED</a> relatively easily.</p><p></p><p><strong><u>Experiment Earth</u></strong>—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.</p><p></p></body></html>


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