I learned that in 1930s we used less energy then we do now. The average home in the 30s used 2 pounds of carbon dioxide,the average home now uses 92 pounds of cd. Each gallon of gas a car uses 172 pounds of cd in 2010,in 30s each gallon of gas the cars used 20 pounds of cd. In the 30s trees absorbed one ton over there lifetime it's the same for 2010. Insulation is used 2 conserve energy inside structures by reducing tempature changes. I learned that how you be safe with electricity, you can do many things wrong, like you can place a object on top of a electrical cord, cause doing that you can damage the cords.also I learned that if u dangle something over a lamp u can cause a fire,and dont pull things by a power cord, just dangerous.