[Baynative]

Over the past three centuries, the concentration of carbon dioxide has been increasing in the Earth's atmosphere because of human influences (Figure 7y-3). Human activities like the burning of fossil fuels, conversion of natural prairie to farmland, and deforestation have caused the release of carbon dioxide into the atmosphere. From the early 1700s, carbon dioxide has increased from 280 parts per million to 380 parts per million in 2005. Many scientists believe that higher concentrations of carbon dioxide in the atmosphere will enhance the greenhouse effect making the planet warmer. Scientists believe we are already experiencing global warming due to an enhancement of the greenhouse effect. Most computer climate models suggest that the globe will warm up by 1.5 - 4.5° Celsius if carbon dioxide reaches the predicted level of 600 parts per million by the year 2050.

[Bob]

I find it amazingly convenient that CO₂ levels for the Medieval Warm Period and the Little Ice Age aren't shown in the graph. I'm quite sure that the data is available from another source than the one ice-core sample that was used.

On the other hand, displaying temperature versus CO₂ levels (warming during the 1920s and 1930s which was followed by cooling until the mid-1970s) would show that increasing CO₂ levels and temperature don't really track well anyway.

[SteamShovel]

The curve does nothing to prove man is causing it.

Correlation with human activity is not proof of cause.

Correlation with temperature rise is not proof of cause.

Besides, I thought its “Climate Change” now, not global warming.