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 if one of the sandbags fall losing stability. Also, if something makes a hole in the fabric of the balloon it could be fatal.
In the future I hope that the Hot air balloons could be made with a strange Fabric and electric powered fan the sand bags. On the bright side it could also be replaced with metal and hold it together to make it safe.