Global Warming: The Chart
(click on chart for larger version)

This chart from the Arctic Climate Impact Assessment presents known facts about carbon emissions, CO2 concentrations, and global temperatures. The scientific explanation of the chart is that as humans began to burn coal with the Industrial Revolution, carbon emissions and atmospheric CO2 concentrations rose steeply; the greenhouse effect, a known fact of physics, then caused temperature to rise.
Those who deny that the chart shows cause and effect ask us to believe three things:
1. Some unknown factor suppressed the greenhouse effect.
2. Some other unknown factor caused the temperature rise.
3. Carbon emissions and CO2 concentrations can continue to rise, but for some unknown reason, temperatures will not continue to rise.