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You need to be very scientific about this. "Global warming" has been pretty much abandoned as a slogan since none of the predictions has turned out to be correct.
Climate change seems to be inevitable. All the records show that the climate at any point on the planet has changed many times, in geological and in written history.
There being no consistently predictive mechanism for prehistoric climate change, nor any means of blaming the 11th-century cooling on human activity, the honest answer (and kids need a bit of honesty in their schooling, as they won't often come across it in adult life) is that the earth's climate is inherently chaotic but appears to be bounded, with rapid increases followed by slow decreases in temperature.
It's a good introduction to critical thinking to consider any such phrase as "the average temperature of the earth is hotter than it has ever been" and ask kids "what does that mean?" and "how do they know?" - these are the important questions that must be asked before assigning blame, predicting the future, or even guessing the mechanism: is the data really kosher? Forensic science, the analysis of complex interactive systems, and making inferences from partial data, are all much more interesting than parsing Shakespeare.
But above all you must insist that it is all their fault, otherwise they will object to paying "green" taxes and having an unreliable electricity supply. Never mind the truth, the careers of many politicians and self-styled "climate scientists" depend on the gullibility of the electorate.
How can I strengthen my students' awareness about climate change?
QuoteHow can I strengthen my students' awareness about climate change?By educating the students about the fundamental differences between water vapor (contrail) and a chemtrail made by exogenous coal fly ash nanoparticles, it should be possible to raise awareness about the consequences of climate hacking. Also, teachers should demonstrate that climate change is fraudulent by tampering with atmospheric composition on a global scale. "In a time of universal deceit - telling the truth is a revolutionary act." -George Orwell
You could teach the students how to distinguish fact from nonsense in a more general sense...