If you choose something from this list, you still have to create a good question. Word your question carefully to make it a great question!
Future temperature estimates / climate models
Ice caps melting and sea level rise
Biodiversity / species extinctions
Human causes or nonhuman causes of climate change
Frequency and intensity of hurricanes or droughts
Ocean acidity and CO2 in the atmosphere
Temperature changes in the more distant past
Habitat loss due to temperature change
Possible benefits of climate change
Different climate change impacts in different countries
Greenhouse gases other than CO2
Cooling effects
Variations in the sun’s intensity
Changes in precipitation patterns
Climate change in Iowa
Food supply / impacts on ability to grow crops in different areas
Reducing CO2 emissions
Proposed solutions to climate change issues
World health issues related to climate change
Emissions in the developing world compared to developed nations
Meeting increasing global energy needs
Economic costs or economic benefits of addressing climate change
Economic losses or economic benefits caused by climate change
Climate change as a conspiracy or hoax
Government policies on climate change