Gasoline will turn an orange color when it goes bad and it will also have a foul odor. New gasoline is a clear with a slight tan color.
yes
It is composed of Carbon, and when burned, that carbon flies into the air as carbon dioxide. Carbon Dioxide is one of the main causes of global warming. Also, gasoline itself is toxic, and kills vegetation and animals exposed to it when spilled.
Animals are not bad.
There are many things that can cause gasoline to go bad. Time (decrease in volatility), oxidation, or water contamination are all culprits.
Gasoline is a fossil fuel and hydrophobic in nature hence obstruct with life supporting activities.
Yes, gasoline starts to go bad when it is about 1 month old. After 6 months you should not burn it in an engine unless you have put a fuel stabilizer in it. In that case it will be usable for about 8 months. This is also important with small gasoline engines on lawnmowers for example. Bad or old gasoline can damage a small engine very easily.
Sure.
drain your tank
lots of money, bad for the environment, dangerous
Gasoline is good for cars and bad for drinking. Lots of people inhale the chemicals and are sent to a vet because they could show characteristics of an animal
They are capable of causing fires and making animals ill.