21. Which of the following is a renewable source of energy?
a) Natural gas
b) Coal
c) Solar power
d) Nuclear power
22. What is the Paris Agreement?
a) A global treaty to limit carbon emissions
b) An organization working towards climate justice
c) A project aimed at restoring coral reefs
d) A conference on climate change held in Paris
23. Which of the following is an effect of ocean acidification?
a) Coral bleaching
b) Decreased fish populations
c) Destruction of marine ecosystems
d) All of the above
24. What is the main cause of deforestation in the Amazon rainforest?
a) Illegal logging
b) Agricultural expansion
c) Urbanization
d) Mining activities
25. What is the primary cause of air pollution?
a) Carbon dioxide emissions
b) Nitrogen oxide emissions
c) Methane emissions
d) Sulfur dioxide emissions
