Which of the following statements correctly highlights the environmental impacts of space exploration?

1. Making satellites is an energy-intensive process. 

2. Every rocket launch releases carbon dioxide, black carbon, and water vapour, amplifying global warming.

3. Rocket propellants deplete the ozone layer and disrupt atmospheric circulation.

4. Satellites burning up in the atmosphere release metallic ash into the middle layers. 

Select the correct answer using the code given below: