Which statement best explains an environmental outcome of using fossil fuels for energy? Fossil fuels release carbon dioxide which plants use to make food

When fossil fuels are bumed they release toxic gases into the air that cause pollution and increase global
warming

When fossil fuels are bumed, hazardous ash is created and carried through the environment by wind and
dropped into nearby lakes and ponds

Fossil fuels produce waste that exposes humans to dangerous levels of radiation

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.