There are many types of pollution, each kind is threatening in its own regard. A type of pollution not often discussed is “space junk” although it does not pose an immediate threat, its long-term effects can prove drastic to humanity’s future space explorations.
It takes tremendous power to launch something into space, the more power used to break through the atmosphere the harder gravity strains to pull it back down.
A rocket usually has 5 large compartments containing rocket fuel. When the fuel from a compartment has been used it detaches from the rocket, letting the next tank of fuel do the same.