[G Larry]

"atmospheric levels of carbon dioxide are increasing"

As proven by what?
What methods, locations, periods, altitudes?????

[gondramB]

""atmospheric levels of carbon dioxide are increasing"

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As proven by what?
What methods, locations, periods, altitudes?????"

One thing they can do is take core samples in deep ice that allows the percent of dissolved carbon dioxide back through tens of thousands of years.

The problem is that CO2 has between increasing steadily and rapidly since the early 1800's but global warming didn't start til almost 100 years later.

[Piquaboy]

Any dummy knows that potholes in the roads are caused by global warming.