- ATMOSPHERIC CARBON DIOXIDE CONCENTRATIONS are higher today than at any time in at least the past 650,000 years.
- They are about 35% higher than before the industrial revolution, and this increase is caused by human activities, primarily the burning of fossil fuels.
- Figure 1. Carbon dioxide concentrations in Antarctica over 400,000 years
- Click on those graphics to actually read them. A few explanatory parameters:
- Here, the growing complexity of climate change models:
- Sea level is projected to rise 0.2–0.6 meters by the year 2100, primarily as a result of thermal expansion of the oceans; however, it may eventually reach values up to several meters higher than today when the disintegration of glaciers and ice sheets contributes more strongly to sea level rise. (A sea level rise of 4 meters would submerge much of southern Florida.)
In the 1990s, Heartland worked with the tobacco company Philip Morris to question serious cancer risks to secondhand smoke, and to lobby against government public-health reforms. Starting in 2008, Heartland has organized conferences to discuss and criticize the scientific opinion of global warming.