$1\mathrm{.}2.1\mathrm{.}3.1\mathrm{.}4.$ Describe how the global economy depends on fossil fuels today.What do you think will be the key energy solutions to meeting the twenty$-$first centurys globalenergy challenge?Do you believe that it is a greater priority for wealthier, industrialized countries to install grid$-$tie PVsystems or for poorer, less developed countries to adopt off$-$grid PV systems?Describe three things that you can do practically in your life today to reduce your energy footpri