The Guardian had a story recently drawing on UK Met Office sources about CO2 levels rising to new levels following the recent El Niño event.

The article says:

“The UN’s Intergovernmental Panel on Climate Change (IPCC) says that CO2 concentrations must be stabilised at 450ppm to have a fair chance of avoiding global warming above 2C, which could carry catastrophic consequences.  Doing that that will require a 40-70% emissions cut by 2050, compared to 2010 levels, and zero emissions by the end of the century.  However, despite the Paris agreement last December and a boost in renewable energy that has at least temporarily checked the growth in global emissions, the world is on track to substantially overshoot the target.

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There are some nice graphics that will be useful for teaching purposes.