For the most up to date information on levels of atmospheric carbon dioxide, have your students explore this resource from NOAA.
This resource is a 6-minute video that asks the question: What would happen if we used up all of the Earth's fossil fuel resources? The scenario is roughly equivalent to 2000 ppm of carbon dioxide, which is a very high emitting future scenario. The resource presents the potential sea level rise, temperature increase, and impacts on droughts and flooding, as well as giving some clear actions to avoid this future scenario. This resource is recommended for teaching.
Next Generation Science Standards (NGSS)
ESS3: Earth and Human Activity
MS-ESS3-3 Apply scientific principles to design a method for monitoring and minimizing a human impact on the environment.
MS-ESS3-5 Ask questions to clarify evidence of the factors that have caused the rise in global temperatures over the past century.
4-ESS3-1 Obtain and combine information to describe that energy and fuels are derived from natural resources and that their uses affect the environment.
5-ESS3-1 Obtain and combine information about ways individual communities use science ideas to protect the Earth’s resources and environment.
HS-ESS3-1 Construct an explanation based on evidence for how the availability of natural resources, occurrence of natural hazards, and changes in climate have influenced human activity.