Have you ever thought of what hot air balloons might become in the future? Hot air balloons present are always good but they have one issue. Hot air balloons release carbon dioxide into the atmosphere hurting the environment.
Hot air balloons can be good but bad as i explained. Hot air balloons hurt the environment with the gas they produce. They also aren't very safe in the sense of if ANY sand bags fall you can lose stability. Also if something makes a hole in the balloon (ripping the fabric) the balloon could fall and be fatal.
In the future I hope that the hot air balloons could be made with a stronger fabric and be electric with a high-powered fan . The sand bags on the side could also be replaced with metal to make it stronger and safer.