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As a consequence , permission for the ritual use of hoasca could have indirect , demand-side effects in the direction of increasing the extent of non-religious use of DMT preparations . Ask the school if you can see a copy of a report card before the day of the conference ; better yet , ask if the principal will have a session for families to explain the report card and the grading system the school uses . However , the inability to precisely control the energy used to pump up the material 's energy level was a key problem in making such a laser work . " " Because the energy used to power the home causes more pollution than the average motor vehicle , " continued Chairman Jackalyne Pfannenstiel , " California could prevent the release of 974 million pounds of carbon dioxide , which contributes to global warming , if each home changed just one bulb . " On average , 30 percent of all the energy used in a home goes for heating and cooling . Despite what some have suggested , we received no intelligence that terrorists were preparing to attack the homeland using airplanes as missiles , though some analysts speculated that terrorists might hijack airplanes to try to free U.S. - held terrorists . Students may want to : use computer technology as the means to create drawings related to the machine and society comment on various youth cultures within the school using photo journalism document individuals at work using a variety of film and video techniques . Remember , the total energy generated in ALL affected systems can never exceed the energy used in the bomb ( That law of conservation of energy and momentum again !