There is a very simple children's science project you can do that simulates the effects of greenhouse gases and global climate change.
If you build 2 closed systems, say glass enclosures sealed with tape. You have one with normal concentrations of atmospheric gases and then in the other you increase the level of greenhouse gases. Expose them both to sunlight for the same amount of time then remove them. The enclosue with more greenhouse gases will keep its temperature longer.
The greenhouse gases we put in the atmosphere have to go somewhere... they just don't disappear. Overall, the concentrations only change slightly, but even slight changes in temperature averages over long periods can damage ecosystems that are tuned to very specific changes.
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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